Peek through a transparent pyramid and drink in the mountain made of books.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This hidden workshop is filled with molds of France's most iconic sculptures.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

A once grand hotel now sits eerily abandoned in the Catalan countryside outside Barcelona.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

An abandoned outdoor movie theater in the Sinai desert.

An alien landscape of chalk-rock in the Egyptian desert.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

An endless sea of white conical domes.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

An ancient city exhumed from the depths of the ocean.

This small Slovenian town has become a magnet for microbreweries.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Just outside of Jordan's capital lies an ancient castle and intriguing caves dating back to the Copper Age.

An oasis of shade and color amidst the bustle of the old city.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.