One-Million-Liter Test Sphere
A landmark in Frederick, with 8 places within a five-minute walk. One of 81 history & landmarks in Frederick.















On the National Register since 1977

One-Million-Liter Test Sphere
One-Million-Liter Test Sphere was added to the National Register of Historic Places on Nov 23, 1977. It is significant for its science at the national level.
The One-Million-Liter Test Sphere—also known as the Test Sphere, the Horton Test Sphere, the Cloud Study Chamber, Building 527, and the "Eight Ball" (or "8-ball")—is a decommissioned biological warfare (BW) chamber and testing facility located on Fort Detrick, Maryland, US. It was constructed and utilized by the U.S. Army Biological Warfare Laboratories as part of its BW research program from 1951 to 1969. It is the…
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The nearest neighbor is Air Force Medical Operations Agency, 1 min walk away.
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8 places within a five-minute walk of One-Million-Liter Test Sphere.
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More history & landmarks in Frederick
Local favorites first.
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Some place details from Overture Maps (CDLA-Permissive-2.0). Changes go live once a second neighbor confirms them. Building history: National Park Service, National Register of Historic Places.