The Devil’s own choice when he needs a drink in Brussels.

This Italian foot path winds through the mountains via 52 individual tunnels.

The middle finger of modernity.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

The remnants of a record-setting industrial bucket system can still be found dotting the Swedish countryside.

The most alien-looking place on Earth.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Rippling sand dunes frozen in the Arizona rock.

Northern Ireland's Brobdingnagian stepping stones.

Fire meets ice at the southernmost volcano on Earth.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Largest site of dinosaur footprints ever found includes more than 5,000 tracks.

Most-visited and most-photographed slot canyon in the American Southwest.

These homes carved into the mountains seem to defy the laws of nature.