http://www.blm.gov/commsites/index.html Some of the sites have photographs. The website is organized by state then BLM region. If you read the details for the site, you can find federal facilities, such as the FBI site in "facility #4" on this document: http://www.blm.gov/commsites/nevada/tonopah/montezuma/Montezuma%20Peak%20Finalized.pdf