North Arroyo in Pasadena in Los Angeles County, California — The American West (Pacific Coastal)

Twenty-Five-Foot Space Simulator

Jet Propulsion Laboratory

Photographed by Craig Baker, October 11, 2026

1. Twenty-Five-Foot Space Simulator Marker

Inscription.
Twenty-Five-Foot Space Simulator has been designated a National Historic Landmark.
This structure possesses national significance in commemorating the history of the United States of America.
1985 - National Park Service - United States Department of the Interior.

Erected 1985 by National Park Service.

Topics and series. This historical marker is listed in these topic lists: Air & Space • Science & Medicine. In addition, it is included in the National Historic Landmarks series list. A significant historical year for this entry is 1961.

Location. 34° 12.15′ N, 118° 10.44′ W. Marker is in Pasadena, California, in Los Angeles County. It is in North Arroyo. It can be reached from Oak Grove Drive 0.3 miles north of Foothill Boulevard. Located in JPL, only accessed during pre-arranged tours. The Space Simulator is not part of any tour. Touch for map. Marker is at or near this postal address: 4800 Oak Grove Dr, La Canada Flintridge CA 91011, United States of America. Touch for directions.

Regionally, this marker

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is in Greater Los Angeles

and in the Transverse Ranges.

It is also on the American Pacific Coast.

Globally, it is in North America,

on the Ring of Fire,

on the Pacific Rim,

in the Western Hemisphere,

in the Western World,

and in the Anglosphere.

Historically, it finds itself in what was once New Spain

and also Mexico’s Alta California.

Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies: Space Flight Operations Facility (about 700 feet away, measured in a direct line); Jet Propulsion Laboratory (approx. 0.2 miles away); The Voyager Spacecraft - Interplanetary Explorers (approx. ¼ mile away); Who was Robert Owens of El Prieto Canyon? (approx. 0.7 miles away); O. Oliver Goodall (approx. 0.9 miles away); Buffalo Soldiers (approx. one mile away); Owen Brown (approx. 1.2 miles away); How El Prieto Canyon Got Its Name (approx. 1.2 miles away). Touch for a list and map of all markers in Pasadena.

Regarding Twenty-Five-Foot Space Simulator. The Twenty-Five-Foot Space

Photographed by Craig Baker, October 11, 2026

2. Twenty-Five-Foot Space Simulator Marker

Simulator, as well as the nearby Space Flight Operations Facility, were each declared a National Historic Landmark and added to the National Register of Historic Places on October 3, 1985.

Also see . . . Twenty-Five-Foot Space Simulator (Wikipedia). Excerpt:

The Twenty-Five-Foot Space Simulator is a chamber for testing spacecraft in space-like conditions, including extreme cold, high radiation, and near-vacuum pressure. Built in 1961, it has been used to prepare many American space probes for their launches, including the Ranger, Surveyor, Mariner, and Voyager spacecraft. Ingenuity, the first helicopter to fly on Mars (2021-2024), was tested here. The Twenty-Five-Foot Space Simulator has a 25-foot inside diameter and stands 85 feet tall. The first facility of its type, the chamber served as an example for other countries seeking to establish space programs.

(Submitted on October 12, 2026.)

Twenty-Five-Foot Space Simulator and Marker image. Click for full size.

Photographed by Craig Baker, October 11, 2026

3. Twenty-Five-Foot Space Simulator and Marker

Twenty-Five-Foot Space Simulator image. Click for full size.

Photographed by Craig Baker, October 11, 2026

4. Twenty-Five-Foot Space Simulator

Photographed by Craig Baker, October 11, 2026

5. Twenty-Five-Foot Space Simulator

Credits. This page was last revised on October 12, 2026. It was originally submitted on October 12, 2026, by Craig Baker of Sylmar, California. This page has been viewed 6 times since then. Photos: 1, 2, 3, 4, 5. submitted on October 12, 2026, by Craig Baker of Sylmar, California.