An underwater city for the dead.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

A mysterious monument where a woman who records say never existed was burnt alive for being a witch.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

Northern Kentucky’s very own Notre Dame showcases intricate stained glass and the bones of saints.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

This observatory comes complete with three separate telescopes and a dedicated community of amateur and expert astronomers.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

Believed to hold the remains of Japan's most infamous fox spirit, this stone is said to kill those who dare approach.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.

Order a boozy baba au rhum at the oldest patisserie in Paris.

The location of the last witch trials of Italy, known as "The Salem of Europe."

The fountain marks the area where hundreds of accused witches were burned at the stake.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Eighteen miniature death-scene dioramas.

A performance hall at the American Jewish University moonlights as a sci-fi film location set.

America's oldest Italian restaurant is a San Francisco institution.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

From a supper club to a gay bar to an HBO shooting location, this 125-year-old Victorian mansion has lived many lives.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.