Old Federal Building

Historical marker location:

Martinsburg, West Virginia

( Marker is on King Street (U.S. 11) near Maple Avenue, on the left when traveling east.)

125 S. Maple Avenue. Completed 1895.

West Virginia is home to the Green Bank Telescope, the world's largest fully steerable radio telescope. It is operated by the National Radio Astronomy Observatory and is located in the Allegheny Mountains.