This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

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

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

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

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

A surreal paleontological sculpture garden pays homage to a fading industry.

The oldest warship in Europe is still afloat.

A little sculpture with a large wardrobe.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Christ's blood preserved in a Belgian town.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

When this 18th-century observatory's meridian was moved, it set Sweden's time back by 0.04 seconds.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's deepest subway station is also a stunning ecological wonder.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

It houses the remains of a 17th-century version of the Titanic.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.