A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Cairns built to bring travelers good luck stretch across the land like miniature stone mountains.

Three columns of volcanic rock shoot out of the ocean.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

Though it may look like a businessman's lost luggage, this case suspended under a highway bridge is actually a contemporary art installation.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

This abandoned, partly demolished building is now home to beautiful graffiti and murals.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

A wonderfully preserved example of London's 1960s-style high-density, low-rise public housing.

The abandoned railway bridge stands hidden in the farmland of rural Cumbria.

The designer of this railway tunnel added a birthday present for himself.

These shopping center benches are actually a modern art installation.

The world's oldest railway bridge in continuous use.

A stone, covered in metal, commemorating an event that happened somewhere else a thousand years ago.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.