A solemn, monumental, kitschy palace of worship honoring victory in the Great Patriotic War.

Former headquarters of the KGB.

A marvel of Byzantine engineering under the streets of Istanbul.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

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

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

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

A lush oasis full of vibrant plants and striking geometric displays.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This indoor ski resort has a mountain contained inside a mall.

This artificial archipelago was supposed to resemble a map of the world.

Skyscraper powered by wind turbines attached between its towers.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

Venice's island of the dead.

This ancient market is often referred to as the oldest shopping mall in the world.

This demon atop the Notre-Dame de Paris looks utterly bored.

This saucy statue once caused outrage among locals.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

The very center of Paris is surrounded by a bevy of strange good luck rituals.