The vast, legendary catacombs hold secrets much stranger than stacked bones.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

This relic of 19th-century infrastructure is one of the few remaining coal gas storage tanks in the U.S.

The shared home of a utopian commune that practiced "free love" a century before the hippies.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

New Jersey's last historic covered bridge was rebuilt from pieces of the original 19th-century structure.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

Once in a state of dilapidation, this candy-inspired fortress is now being revived.

Impressive mining ruins overlook a spectacular view of Ireland's Copper Coast.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.