The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

A beautiful art space and unusual mini-hotel hidden in the city center of Dnipro.

At 130 years old and 126 feet tall, it is the largest known example of the rare Torrey pine tree.

The soaring gondola lines form the longest aerial cable car system in the world.

This sublime architectural marvel is a rare example of an expressionist church.

Ruins and statues dot the landscape of this tiny island rich with royal history.

A plaque immortalizes the spot where the early American spy said his famous last words: "I only regret that I have but one life to lose for my country."

China’s breathtaking futuristic library is lined floor to ceiling with fake books.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Forgotten for decades, the first medical school built in Communist China is full of surprises today.

The world's largest human gathering is held at the confluence of three sacred rivers, one of which is mythical.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

Ernest Hemingway was the first to sign this colorful wall covered in thousands of celebrity signatures.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

You would never come across this tiny green oasis if you didn't know it existed.

Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

These colorful French islands spent a stint bootlegging booze during American Prohibition.

A beautiful Arctic museum and nature center preserves the culture of the Sámi people.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

Long-forgotten artifacts give incredible insight into New York's most glamorous hotel.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Famous and forgotten figures lie beneath the faded headstones and decaying planks of wood.

The eclectic observatory castle of a 19th-century astronomer and explorer.