One part local history, 99 parts gruesome haunted house.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

360° views of the city plus five floors of optical illusions and hands-on science.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A semi-scholarly approach to sex.

A fifth-century temple improbably built into the side of a cliff.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

A slice of central Asia in the middle of Berlin.

The most alien-looking place on Earth.

A museum of carnival attractions where you are invited to ride the rides.

Bioluminescent firefly squid light up this Japanese fishing port.

The most visited, and possibly most controversial, museum in Germany.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The intriguing personal collection of a professional demon-chaser.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

Surreal riveted sea forts once protected the Kent shores from German attack.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.