After Tesla invented alternating current, we went to Wardenclyffe, NY and began to experiment with what would become radio waves.
On this site he built a laboratory, massive tower, and extensive “secret” tunnels. The place is littered with giant batteries, and half-finished experiments that are now dilapidated.
The current owners of the site are looking to sell the place, and are willing to level the location for the new owners.
Tesla fans are trying to come up with the money to preserve the site.