An ancient fortification lives on in this Chinese city.

A fifth-century temple improbably built into the side of a cliff.

Massive series of 45 caves and over 51,000 sculptures carved from cliffsides in China.

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

This human-made pond is part of a Korean palace complex first built in the 7th century.

Numerical symbolism abound at East Asia's oldest observatory.

This tomb's name derives from a famous painting of a white horse found inside.

A guardian spirit sculpture that once guarded the tomb of a 6th-century Korean king.

The supreme shrine of the state.

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

A symbol of hope, survival, and national character, especially after it rose phoenix like from the flames.

A large visitor's complex and place of remembrance on the outskirts of the DMZ.

Secret North Korean passage discovered below the world's most dangerous border.

The best place for scenic views of the DMZ and North Korea.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

The "Key of Keys" for Washington, D.C. and the apocryphal landing place for the military campaign that started George Washington's career is now at the bottom of a well.

Decades before the scandal, this staircase on the river was a literal "water gate."

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An overlooked memorial honoring the local Washington residents who died in World War I.

There’s a hidden military meme engraved on the World War II Memorial.

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

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The most magical part of this Latin American and Caribbean art museum is a room covered in beautiful blue tiles from floor to ceiling.