These slanted cubic abodes are a creative if odd solution to a zoning pickle.

An icon of International Style architecture on the outskirts of Rotterdam.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

Fortified homes of highland warriors that are still in use today.

Underground monastery and fortress.

Ancient rock-hewn town that witnessed key events of Georgian history.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

With over 10,000 lights, this engineering marvel lights up the city after dark.

An open-air art gallery that aims to share the stories of the people who live around it.

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

This micro-nation may be some sort of prank, but its constitution sure seems official.

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

Over time, this castle grew to encompass the entire island.

Originally planted by the ancient Carthaginians, this sprawling palm grove is one of the largest in the world.

Few symbols capture the spirit of Catalonia more vividly than its tradition of human towers.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

An Antoni Gaudí masterpiece in Astorga.

Long tunnels run under the ancient chariot racing circuit to the tower.

This Roman arena once played host to bloody gladiatorial battles.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

A medieval village holds a very modern hotel.