Established hundreds of years ago, Gandan remains the premier Buddhist monastery in Ulaanbaatar.

The monastery survived the Communist revolution in Mongolia as a religious museum.

This massive piece of aviation history calls this residential neighborhood home.

A beloved tribute to the Fab Four and the freedoms they inspired.

Enormous statue of the Emperor of the Mongols.

A hike outside of the town of Zuun Mod will take visitors to a monastery complex steeped in Mongolian history.

A striking public sculpture representing the period of martial law in Communist Poland.

The silly symbol for an underground protest group is now scattered around the city.

The hidden lair of an alchemist rediscovered in a 2002 flood.

The ruins of a medieval bridge are visible inside a Prague Metro station.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A slice of central Asia in the middle of Berlin.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

Tucked into Pittsburgh’s North Side, the Mattress Factory is a labyrinth of permanent, room-sized installations where artists transform entire spaces into mind-bending, immersive worlds.

This experiment in the lifespan of seeds will take a century before it is complete.

As its grandiose name implies, this wooden dome is unsurpassed in size.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.