A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

Beneath the city of Lourdes, France is a massive, concrete church.

Collect holy water from a Bronx grotto.

Perhaps the most beautiful of preserved saints, with a little help from Paris.

This museum preserves over-the-top masterpieces that once qualified artisans for membership into a medieval guild.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

Artist and musician Will Menter creates musical sculptures.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

If they push on just the right spot, even the weakest person can move this titanic boulder.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A museum in the childhood house of a medical pioneer.

Dine on Hungarian-Jewish dishes at this multigenerational, family-run institution.

A Hungarian pharmacy museum with a box full of mummy powder.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Once the home of a hermetic monk, this cave now houses a small church.

These caves secretly held national treasures during World War II.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.