The "Seinfeld" diner.

This historic stadium was built to host the first-ever FIFA World Cup.

This majestic building, where Brazil's coffee brokers once bought and sold beans, now houses a coffee museum.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

The world's brightest bioluminescent bay.

Send a postcard while vacationing with Satan.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

Sacred Buddhist home of some spiritual monkeys.

The once highest point in China blends symbolic design with a kick of adrenaline.

This probably wasn't what Mao had in mind.

The most famous location in China was home to whole dynasties worth of imperial rulers.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

The stunning interior of this Gothic church is covered in ornate gold details.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

One man's remarkable private collection of art from around the world.

The world's oldest bookshop still in operation.

A medieval church built up to defend its village.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

Something's watching you.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.