201 ► Arizona, Pinal County, Florence — Huffman House — 1919 — Historic Site —

On East Butte Avenue east of North Park Street, on the right when traveling east.

202 ► Arizona, Pinal County, Superior — What is the Story Behind the Picketpost House? — ... a wealthy man built a house and planted a vision —

Near U.S. 60 at milepost 223 at Boyce Thompson Road, on the right when traveling east.

203 ► Arizona, Santa Cruz County, Nogales — Padre Eusebio Francisco Kino SJ —

Near West Kino Park Place.

204 ► Arizona, Yavapai County, Prescott — The Day Octagon —

On East Gurley Street east of South Marina Street, on the right when traveling west.

205 ► Arizona, Yuma County, Yuma — Main Cellblock — Yuma Territorial Prison State Historic Park —

Near Prison Hill Road 0.5 miles north of Harold C. Giss Parkway.

206 ► Arkansas, Carroll County, Eureka Springs — Sweet Spring Hotel - Huntington Infirmary - Sweet Spring Home —

On Spring Street at Pine Street, on the left when traveling east on Spring Street.

207 ► Arkansas, Carroll County, Eureka Springs — The Springs —

On Spring Street, on the left when traveling north.

208 ► Arkansas, Chicot County, Lake Village — Saunders-Pettit-Chapman-Cook Plantation Home —

On U.S. 278 0.4 miles east of U.S. 65, on the right when traveling east.

209 ► Arkansas, Craighead County, Jonesboro — Nash-Reid-Hill House —

On West Matthews Avenue at Witt Street, on the right when traveling west on West Matthews Avenue.

210 ► Arkansas, Crawford County, Van Buren — CSI: Van Buren —

Near North 3rd Street 0.1 miles south of Knox Street, on the right when traveling south.

211 ► Arkansas, Crawford County, Van Buren — Dr. Charles Fox Brown House —

On Drennen Street at South 6th Street, on the right when traveling east on Drennen Street.

212 ► Arkansas, Crittenden County, Marion — Crittenden County Health Department — Erected 1938 Annex 1943 — Courthouse Square Walking Trail —

On Court Street west of Cypress Drive, on the right when traveling south.

213 ► Arkansas, Faulkner County, Conway — Cherokee Memorial —

Near State Highway 319 1.7 miles west of Old Morrilton Highway (U.S. 64).

214 ► Arkansas, Garland County, Hot Springs — Al Simmons — Hot Springs Historic Baseball Trail —

On Whittington Ave. at Whittington Place, on the right when traveling east on Whittington Ave..

215 ► Arkansas, Garland County, Hot Springs — Buck Ewing — Hot Springs Historic Baseball Trail —

On Reserve Street, on the left when traveling east.

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216 ► Arkansas, Garland County, Hot Springs — Dead Chief Trail —

On Grand Promenade Trail 0.2 miles south of Fountain Street, on the left when traveling south.

217 ► Arkansas, Garland County, Hot Springs — Dr. Edith Irby Jones — Medical Pioneer — Hot Springs Arkansas Walk of Fame —

On Central Avenue (State Highway 7) just north of Spring Street, on the right when traveling north.

218 ► Arkansas, Garland County, Hot Springs — Edith Irby Jones — Physician — 1927 —

On East Grand Avenue (Business U.S. 70) just east of Malvern Avenue, on the right when traveling west.

219 ► Arkansas, Garland County, Hot Springs — Hot Springs/Garland County Ambulance Service —

On Broadway Street just south of Market Street, on the right when traveling south.

220 ► Arkansas, Garland County, Hot Springs — Ral Springs —

On Grand Promenade 0.2 miles south of Fountain Street, on the left when traveling south.

221 ► Arkansas, Garland County, Hot Springs — Tufa Terrace Trail —

On Grand Promenade Trail 0.6 miles south of Fountain Street, on the left when traveling south.

222 ► Arkansas, Garland County, Hot Springs, Hot Springs National Park — Cold Water Springs — Hot Springs National Park —

On Mountain Drive 0.1 miles south of Fountain Street, on the right when traveling south.

223 ► Arkansas, Garland County, Hot Springs, Hot Springs National Park — Thermophiles —

Near Central Avenue.

224 ► Arkansas, Garland County, Hot Springs, Hot Springs National Park — Water Quality through Time —

Near Central Avenue.

225 ► Arkansas, Grant County, Leola — 115 — Officers Killed / Union Wounded —

On Arkansas Route 46 at County Road 6, on the right when traveling south on Arkansas Route 46.

226 ► Arkansas, Phillips County, Helena — Answering a Call for Help —

On Walnut Street at Perry Street, on the right when traveling north on Walnut Street.

227 ► Arkansas, Phillips County, Helena — The Irish Immigrant — A Part of the Civil War Discovery Trail —

Near Pecan Street south of Perry Street, on the right when traveling south.

228 ► Arkansas, Pulaski County, Little Rock — Alexander George House —

Near East 3rd Street at Dean Kumpuris Street, on the left when traveling east.

229 ► Arkansas, Pulaski County, Little Rock, Central High Historic District — Dr. John G. Thornton — (1873 - 1957) —

On West 15th Street east of Dr. M.L.K. Jr Drive, on the left when traveling east.

230 ► Arkansas, Pulaski County, Little Rock, Downtown — First Site: Arkansas College of Medicine —

On W. 2nd Street, on the right when traveling east.

231 ► Arkansas, Pulaski County, Little Rock, Macarthur Park — The First Human Dissection in Arkansas —

On McMath Avenue at East 11th Street, on the right when traveling south on McMath Avenue.

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232 ► Arkansas, Randolph County, Pocahontas — Futrell Pharmacy —

On West Broadway Street, on the left when traveling west on West Broadway Street.

233 ► Arkansas, Washington County, Canehill — Dr. William and Laura Welch House - 1855 —

Near State Highway 45 south of Patterson Road, on the right when traveling north.

234 ► Arkansas, Washington County, Fayetteville — Advances in Nutrition —

Near North Campus Walk south of West Maple Street.

235 ► Arkansas, Washington County, Fayetteville — Cotton Stacking —

Near West Dickson Street at North Duncan Avenue.

236 ► Arkansas, Washington County, Fayetteville — Development of ‘Arksoy’ —

On West Maple Street.

237 ► Arkansas, Washington County, Fayetteville — First Biological Herbicide —

On West Maple Street at Oakland Avenue, on the right when traveling east on West Maple Street.

238 ► Arkansas, Washington County, Fayetteville — Nuclear Chemistry —

Near North Campus Walk south of West Maple Street, on the right when traveling south.

239 ► Arkansas, Washington County, Fayetteville — Statistical Avian Ecology —

On North Campus Walk east of North McIlroy Avenue, on the right when traveling east.

240 ► Arkansas, Washington County, Fayetteville — Superconductivity —

On West Dickson Street east of North Harmon Avenue, on the right when traveling east.

241 ► Arkansas, Washington County, Fayetteville — Wide Area Bar Code Reader —

On North Campus Walk north of West Dickson Street, on the left when traveling west.

242 ► Arkansas, Washington County, Prairie Grove — Dr. James W. and Joy Nelson Webb —

On East Buchanan Street (Business U.S. 62) at North Neal Street, on the right when traveling west on East Buchanan Street.

243 ► California, Alameda County, Albany — 6 — Site of Albany Hospital —

On Marin Avenue at Masonic Avenue, on the right when traveling west on Marin Avenue.

244 ► California, Alameda County, Berkeley — Gilman Hall — University of California — Berkeley, California, 1916-1917 —

Near Oppenheimer Way at South Drive.

245 ► California, Alameda County, Berkeley — Observatory Hill —

Near Hearst Avenue at Euclid Avenue.

246 ► California, Alameda County, Berkeley — The Lawrence 37-Inch Cyclotron —

On Centennial Drive south of Grizzly Peak Boulevard, on the left when traveling south.

247 ► California, Alameda County, Berkeley, North Berkeley — Edward A. Brakenridge House — Ira A. Boynton Designer & Builder (attributed), 1892 —

Near Bonita Avenue south of Rose Street, on the right when traveling south.

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248 ► California, Alameda County, Berkeley, South Berkeley — Charles W. Woodworth House — 1905 —

On Carleton Street west of Ellsworth Street, on the right when traveling west.

249 ► California, Alameda County, Berkeley, Southwest Berkeley — Rumford's Pharmacy — Berkeley History —

On Sacramento Street north of Ashby Avenue, on the left when traveling north.

250 ► California, Alameda County, Berkeley, University of California Berkeley — Ernest V. Cowell Memorial Hospital —

Near Piedmont Avenue.

251 ► California, Alameda County, Emeryville — Development of Computer Graphics and Visualization Techniques, 1965-1978 — IEEE Milestone —

On Park Avenue, on the left when traveling east.

252 ► California, Alameda County, Emeryville — PCR Park —

On 53rd Street west of Hollis Street, on the right when traveling west.

253 ► California, Alameda County, Emeryville — The Development of RenderMan for Photorealistic Graphics, 1981-1988 — IEEE Milestone —

On Park Avenue, on the left when traveling east.

254 ► California, Alameda County, Hayward — A Salty Experiment in Habitat Management — Eden Landing Ecological Reserve —

On Eden Landing Road near Arden Road, on the left when traveling south.

255 ► California, Alameda County, Hayward — The Archimedes Screw Pump — From "The Oliver Salt Trail" by J. Herbert, M. Koslosky, and A. De Ponte —

Near Breakwater Avenue near Johnson Road.

256 ► California, Alameda County, Livermore — A Natural Supermarket and Hardware Store — Sycamore Grove Park —

Near Wetmore Road.

257 ► California, Alameda County, Livermore — D.J. Murphy House —

On McLeod Street at Third Street on McLeod Street.

258 ► California, Alameda County, Livermore — Dr. Henry Gordon McGill House — Built: 1910 — Architect: Julius L. Weilbye —

On South Livermore Avenue, on the right when traveling north.

259 ► California, Alameda County, Livermore — Lawrence Livermore National Laboratory —

Near Eastgate Drive west of Greenville Road.

260 ► California, Alameda County, Livermore — Livermorium —

On South Livermore Avenue at First Street, on the right when traveling north on South Livermore Avenue.

261 ► California, Alameda County, Livermore — Livermorium Plaza —

Near South Livermore Drive at First Street, on the right when traveling north.

262 ► California, Alameda County, Livermore — On this Site Stood the Hydropathic Building — Built: 1904 — Demolished: 1965 —

On College Avenue at South L Street, on the right when traveling east on College Avenue.

263 ► California, Alameda County, Livermore — Saint Paul's Hospital — Built 1927 —

On South J Street, on the right when traveling south.

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264 ► California, Alameda County, Livermore — The Gables — Built Circa 1895 —

On Arroyo Road, on the right when traveling south.

265 ► California, Alameda County, Livermore — The Story of Livermorium —

Near South Livermore Avenue at First Street.

266 ► California, Alameda County, Oakland, Downtown Oakland — Chabot Observatory — Founded 1883 —

On Jefferson Street at 11th Street, on the right when traveling south on Jefferson Street.

267 ► California, Alameda County, Oakland, Mountain View Cemetery — Samuel Merritt, M.D. —

Near Millionaires Row, on the right when traveling north.

268 ► California, Alameda County, Piedmont — Sulphur Springs Grotto — The Healing Powers of Mineral Springs —

Near Wildwood Avenue, on the right when traveling west.

269 ► California, Alpine County, Markleeville — Grover Hot Springs —

Near Hot Springs Road.

270 ► California, Amador County, Fiddletown — Chew Kee Store —

On Fiddletown Road.

271 ► California, Amador County, Jackson — 21 — Dr. Sharp's Drug, Ginocchio's Store — No. 21 — Historic Main Street -Jackson —

On North Main Street at Water Street, on the left when traveling south on North Main Street.

272 ► California, Amador County, Jackson — NR07000507 — William J. Paugh House —

On Center Street near State Highway 88, on the right when traveling north.

273 ► California, Amador County, Sutter Creek — Sutter Creek Sanitarium — 1895 - 1927 —

On Main Street (Old Highway 49) south of Randolph Street, on the right when traveling north.

274 ► California, Amador County, Volcano — 715 — Astronomical Observatory —

On Consolation Street at Main Street, on the right when traveling north on Consolation Street.

275 ► California, Amador County, Volcano — 715 — Astronomical Observatory —

On Shake Ridge Road 1 mile west of Rams Horn Grade, on the left when traveling west.

276 ► California, Butte County, Oroville — First Pharmacy —

On Montgomery Street, on the left when traveling east.

277 ► California, Calaveras County, Angels Camp — Camp 9 Powerhouse Pelton Wheel —

Near South Main Street (California Route 49).

278 ► California, Calaveras County, Murphys — Albert A. Michelson — Dec. 19, 1852 – May 9, 1931 —

On Main Street west of Church Street, on the right when traveling west.

279 ► California, Contra Costa County, Martinez — 608 Talbart — Old Town Martinez — Home of Historic Interest —

On Escobar Street at Talbart Street, on the right when traveling east on Escobar Street.

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280 ► California, Contra Costa County, Martinez — Birthplace of the Martini — 🍸 —

On Alhambra Avenue at Masonic Street, on the right when traveling north on Alhambra Avenue.

281 ► California, Contra Costa County, Walnut Creek — 160 — Leech House & Medical Clinic — 1525 N. Main St. — Early 1870s —

On North Main Street at Lincoln Avenue, on the right when traveling south on North Main Street.

282 ► California, Contra Costa County, Walnut Creek — What Are Those Towers For? —

Near Summit Road 11 miles north of Blackhawk Road, on the right when traveling north.

283 ► California, El Dorado County, Coloma — Site of Doctor Taylor's Store —

On Coloma Road (California Route 49) south of Mt Murphy Road, on the right when traveling north.

284 ► California, El Dorado County, Placerville — James G. Eddy — April 7, 1881 - June 5, 1964 —

Near Carson Road 0.3 miles east of Union Ridge Road.

285 ► California, El Dorado County, Placerville — Snowshoe Thompson —

On Main Street at Sacramento Street, on the right when traveling east on Main Street.

286 ► California, Fresno County, Coalinga — “Dr. Bill” — Born August 4, 1904 – Passed September 27, 1963 —

On Coalinga Plaza (North 5th Street) north of East Cedar Avenue, on the right when traveling north.

287 ► California, Humboldt County, Eureka — August Palmtag Building — Queen Anne Architecture — 1893 —

On 2nd Street at F Street, on the right when traveling east on 2nd Street.

288 ► California, Humboldt County, Eureka — The Thomas F. Ricks House —

On H Street at 8th Street, on the left when traveling north on H Street.

289 ► California, Humboldt County, Ferndale — 2009-8 — "Poppa Joe's" —

On Main Street (California Route 211) at Brown Street, on the right when traveling south on Main Street.

290 ► California, Inyo County, Big Pine — The Millimeter Interferometer — Owens Valley Radio Observatory —

Near Leighton Lane 3.8 miles north of Route 168.

291 ► California, Inyo County, Independence — 223 — Putnam’s Stone Cabin —

On Highway 395 south of Bush Street, on the right when traveling south.

292 ► California, Inyo County, Independence, Manzanar National Historic Site — Caring for Those in Need — Manzanar Hospital —

Near Manzanar Reward Road west of U.S. 395.

293 ► California, Inyo County, Owens Lake — New Water, New Life — Owens Lake Project — Plover Wing Plaza —

Near California Route 136.

294 ► California, Inyo County, the Inyo National Forest — Dr. Edmund P. Schulman — Schulman Grove — Bristlecone Pine Forest —

Near White Mountain Road 10 miles north of Route 168, on the right when traveling north.

295 ► California, Kern County, Bakersfield — Dentist's Office —

Near Chester Avenue.

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296 ► California, Kern County, Bakersfield — Doctor's Office —

Near Chester Avenue.

297 ► California, Kern County, Bakersfield — Hospital —

Near Chester Avenue.

298 ► California, Kern County, Bakersfield — Undertaker's Office —

Near Chester Avenue.

299 ► California, Kern County, Edwards AFB — Air Force Flight Test Center — AIAA Historic Aerospace Site —

On Rosamond Boulevard 4.8 miles east of West Gate, on the left when traveling east.

300 ► California, Kern County, Edwards AFB — Rocket Site — AIAA Historic Aerospace Site —

Near Mercury Boulevard 2.5 miles east of Rocket Site Road.

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