The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

Elevated freight railway turned wildly successful urban park.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This former coal gasification plant found a curious second life as a popular public park.

This repurposed church offers a more literal way to get closer to the heavens.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

An abandoned underground bathroom is now a space for public art.

There are two legends behind the origin of this unusually tall sanitary structure.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A public urinal so pretty, it was declared a national monument.

Modern art meets modern convenience in possibly the world's most architecturally important public bathroom.

Norway has built what may be the world's most beautiful public toilet.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

The massive steel ring looks like it could be China’s first Stargate.

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

This ancient sword lay in a waterlogged tomb for 2,500 years, but managed to remain relatively untarnished and impressively sharp.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Mosaics, storks, and brothels—this ancient city has it all.

An ancient city hidden in the heart of the Sierra Nevada mountains.