Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

It commemorates one of the world's earliest telegraphs.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

The narrowest street in Paris.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

This giant sculpture made of trash is a critique of society's wastefulness.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

This mysterious marker puzzles pedestrians and infuriates geographers.

Twice a year, this floating library delivers thousands of books to the remote islands of Stockholm’s archipelago.

An island graveyard with spectacular views of the Caribbean.

This riverside restaurant has been serving customers since 1146.

These otherworldly caverns form Earth's oldest known cave system.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

A solemn reminder of the infamous World War II war crime that massacred almost all the men in a small Greek town.

This magnificent Art Deco church is a reflection of Lithuania’s turbulent history.

This lake’s emerald green waters are a spectacular sight, but it’s not a great place for a swim.

This colorful but controversial ceiling has been likened to a 21st-century Sistine Chapel.

It would take you approximately an hour and a half to walk to the end of Mexico's largest pier.

This dazzlingly turquoise mountain lake was created in the wake of a natural disaster.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

This extraordinary geological oddity resembles human-made pavement.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.