The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

Portraits of musicians line Oude Binnenweg, the jazziest street in the city.

This charming pup is meant to celebrate the youth and stubbornness of the city's students.

This unique sculpture proved invaluable when it saved a train from careening off the tracks.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

One of the oldest and most significant collections of Ancient Egyptian archeology outside of Egypt.

A kaleidoscopic warehouse-maze of handmade neon signs.

Catacombs turned marketplace.

A little slice of Japan and its aesthetics in London's Holland Park.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

A gorgeous example of 13th-century Gothic architecture.

Pilgrimage site for star-crossed lovers.

Incredible labyrinth of man made caves.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

A beautifully eclectic mix of architectural styles.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.