A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

An astounding collection of medical specimens, including bits of President Lincoln.

Exact replica of the ancient monument, but much, much lighter.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Largest private bird collection in Iceland, formed from a tragic accident.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

Journey through a collection of over 35,000 Halloween items from all generations.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

A small museum along the Susquehanna River is home to a rich collection of Native American artifacts.

An outlandish shoe shaped house built by an eccentric millionaire.

Outsider art meets paleontology at this roadside reptile repository.

This free, take-a-book shop seems like a trick but isn't.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

The narrowest house in America is seven feet of pure spite.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

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

A historic neighborhood church is reborn as a psychedelic arts collective.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.