Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A derelict bit of transportation infrastructure hidden in the woods.

Ship skeletons haunt Baltimore's waterways.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

An eerie, decaying ghost town destined to fade into the forest.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.