This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

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

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

The colonial city's social history is reflected in its fanciful door knockers.

Heavily bombed during the Vietnam War, this small town turns unexploded munitions into utensils.

Follow the original medieval paths that wind through this intriguing section of the city.

A small museum in the Bay of Pigs gives the Cuban perspective on the famously failed U.S. invasion.

Washington's iconic carousel has a nice piece of Civil Rights history.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Eyam took steps to quarantine themselves and keep the plague from spreading.

Ancient serpentine sacrifice holder that has stood the test of time.

A Japanese cat island also populated by the descendants of a band of banished samurai.

A simple tribute to the migrant workers who landed here before walking hundreds of miles to Victoria's gold mines.

Bali's remote "gateway to heaven" is one of the most sacred places on the island.

Two identical statues by Fernando Botero, one blown to pieces in a terrorist bombing, the other donated as a gift for peace.

The Andean town where every single building is decorated with a brightly colored frieze.

A comprehensive collection of bonsai set in a beautiful campus.

The highest bridge in Myanmar was once the tallest railway bridge in the world.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

Ho Chi Minh's perfectly preserved body has been on display here since 1975.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Some of England's last cave dwellers lived and worked within this huge cave.