A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

One woman's Viking Castle on Lake Tahoe.

A wall of chewing gum moonlights as collective art.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A giant Troll lurks under one of Seattle's oldest bridges.

A 125-meter long "tribute to the Brazilian people."

Occult books, tarot, oddities.

The only pollutant in the clear blue water is sunscreen.

Come for the flowers, stay for the bats!

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

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

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

One part local history, 99 parts gruesome haunted house.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The final resting place of the great navigator, or maybe his brother.

The world's largest wooden structure.

Most prolific publishing house in the 1600s open to the public.

A collection of biblical memorabilia.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

The most visited, and possibly most controversial, museum in Germany.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.