A palatial art deco restroom.

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

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

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

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

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

The blinking light atop the iconic landmark has been sending secret messages for decades.

This century-old cinema is complete with musical interludes and boasts a rare projection system.

This modernist cinema has survived war and reconstruction to become a symbol of Lebanon’s revolutionary spirit.

Europe's official "zero-level," the equator of elevation.

A geothermal energy project gone wrong is fracturing the city's picturesque architecture.

The interior of this Serbian royal family's mausoleum is covered with exquisite mosaics.

This 7,000-year-old megalithic wonder covered by a Franco-era reservoir emerges in times of drought.

A popular 19th-century natural landmark is now hidden within a sprawling forest.

Double spiral staircases are not unheard of, but they are very rare.

This enormous spiral sculpture looks strangely out of place on the edge of a housing development.

Blue-green pools and smooth stones comprise one of Spain’s most idyllic hidden wonders.

The curious underground history of keeping Paris clean.

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

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

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

Vines grow up the metal bars in this public park created from an old machine factory.

Museum dedicated to wax representations of disfiguring diseases.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.