Hydraulic systems in an ancient underground Iranian city.

Twelve natural mummies are displayed in the crypt of this former monastery school.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

A huge monument to a bizarre book written by Turkmenistan’s longstanding dictator.

An eccentric dictator's take on a Turkmen version of Disneyland.

A sophisticated astronomical tower built by one of the greatest Persian scholars of the Islamic Golden Age.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

A charming flea market shop dedicated to retrofuturistic apparati.

This hidden workshop is filled with molds of France's most iconic sculptures.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Former villa and estate of James Deering developed to preserve native tropical forests.

This Bronx apartment building is officially recognized as the birthplace of hip-hop.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

This historic stone bridge has an entire neighborhood clinging to its sides.

Every year model trains zip through a miniature New York City that's now 150 landmarks strong.

The first and only carousel with a lineup entirely of insects.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

A German town is growing a building out of trees.

America's only city hall with minarets took architectural cues from Ali Baba and the Forty Thieves.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

A unique sculpture park that specializes in the huge and bizarre.

This tiny structure was built by the creator of the Brooklyn Bridge.