This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

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

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

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

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A public urinal so pretty, it was declared a national monument.

The stunning interior of this Gothic church is covered in ornate gold details.

The most southerly spot on New Zealand's South Island is home to surreally shaped, permanently mangled trees.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

Every inch of this chapel is covered in craftsmanship from across the world.

A cluster of granite granaries perched on stilts.

A remarkably well preserved tower dating all the way back to the Iron Age.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

The glacier tucked within a New Zealand rainforest.

Abandoned medieval hill town.

Five candy-colored villages on the Italian Riviera.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Thousands of well-dressed mummies below a monastery.

Pompeii's less famous neighbor is still revealing her secrets.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.