This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

An old slave lookout in Cuba's historic sugar cane fields.

After the Cuban Revolution, the famous rum company had to leave their swanky headquarters behind.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

The world's smallest drawbridge.

Tours drive right past this military burial ground to get the the Shirley Heights lookout.

Once a luxurious flagship of the Soviet Union, this Brutalist structure remains a landmark of Tashkent’s communist past.

Controversially restored in the 1970s, this giant 15th-century mosque is shrouded in legend.

Prowl through this sprawling bazaar under a massive Soviet-era dome for delicious eats.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

One of the most ethnically diverse spots on the planet.

Final palace complex of the last of 29 Kokand rulers.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

The world's second-tallest flagpole stands proud despite dropping rank.

This medieval citadel once guarded the western entrance of the Pamir Highway.

This ancient Silk Road outpost overlooking the Wakhan Valley is miraculously still standing.

You can still see the remains of a sacred 3,000-year-old cypress.

A museum commemorates what was once the largest freight station in Taiwan.