If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Striking, enormous gold-plated sculpture of Buddha installed in the 19th century.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

Next to Salt Lake City's Assembly Hall stands a tribute to some unlikely heroes of early Mormon settlers.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

The oldest continuously inhabited street in America.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

"A hideous albatross in the Hudson River Valley."

This pirate-broadcasting-tower-turned-restaurant played a rebellious role in the history of Dutch television.

The first KFC is on the National Register of Historic Places.

Picturesque basketball courts sheltered by historical defensive walls and with an enviable sea view.

A full figure 4th century incorruptible saint lies in a glass coffin in Croatia.

Gargoyle head that brings good luck.

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

This fortified town dating back to the 1400s is often described as an open-air museum and is a protected National Monument of Bosnia and Herzegovina.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

Construction of this bridge was once described as an "act of violence" against a neighboring country.

Longest fortress system anywhere in Europe.

The first mosque in the world to receive electricity.

A monument on the pavement marks the spot where two cultures that shaped Sarajevo come together.