Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

These pastel-colored homes were built when the island of Macau was a Portuguese colony.

Elegant marble and old vaults fill this historic Dutch bank turned office space.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

In the hometown of the Catholic saint and Nobel Peace Prize winner, a memorial dedicated to her legacy.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

This no man's land slicing through the island is strewn with abandoned relics of another time.

Liechtenstein's royal family calls this medieval alpine castle home.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

A whimsical bridge adorned with decorative dragons.

In a lighthouse by a vanished sea stands a museum for a man who never existed.

Walk through Czech history in Prague's largest graveyard.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This 13th-century UNESCO-listed "lion's house" mosque is named after a repurposed lion sculpture.

Resting place and mausoleum of the founder and first president of Turkey.

This harrowing memorial remembers a murdered investigative journalist.

This elevator was built in 1907 to connect two neighborhoods separated by a steep, rocky cliff.

An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

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

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.