Michelle P.
Google
The VLBA is actually 10 radio telescopes stationed across 5,351 miles. It is useful in peering through glowing gas clouds to discover planets in distant galaxies and look at supergiant black holes. It also keeps track of potential "killer" near Earth asteroids. I don't think visitation by the general public is ever allowed, but it's cool to snap a pic and know a little about it's interesting purpose!