Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

One man's homage to the sun continues to grow like a glass fractal.

America's most famous piece of self-built architecture.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

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

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

What remains of the summer palace of King Kamehameha III.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

Mysterious 500-year-old tapestries depict a unicorn hunt.

Ride the subways of yesteryear.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

A fascinating insight into daily life in the Eastern Bloc.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An eerie, derelict amusement park in Berlin.

The community pools that the community refused to give up on.

Hidden in a Scotland museum is a copse of extinct tree stumps.