The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

Although resembling a grand Buddhist temple, this structure is actually the largest mosque in China.

An ancient fortification lives on in this Chinese city.

An out-of-place slice of France, smack in the middle of Shanghai.

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

This smaller cousin of the Forbidden City has gone from ancestral sacrifice to tourist's whispers.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

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

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.

Besides being home to cave paintings and pre-Columbian Cuban archaeological remains, you get to take a boat through this stalactite and stalagmite covered cave.

A colossal statue with a controversial past, forgotten for more than 30 years.

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

Neo-cave art on the macro scale.

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

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

Eat the ultimate iteration of Portugal's most beloved pastry.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Perhaps the most spectacular grotto along the Algarve coastline.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.