The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

This might just be the TARDIS of bookstores.

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

A hidden alley in urban Baltimore is a haven for graffiti artists.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.