Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A lush indoor jungle fills this bustling Madrid transportation hub.

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

These distorting, funhouse mirrors achieved fame in a renowned piece of Spanish theater.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This little sun pays homage to a massive gate that once stood at this location.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

Memorial to the lost dead of Gdansk, whose resting places were destroyed during World War II.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

This Communist-era residential block is one of the longest residential building in Europe.

The site of the first battle of World War II.

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

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

1513 Turkish world map, full of European state secrets and snarky commentary.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A fountain standing as a testament to a doomed alliance.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A marvel of Byzantine engineering under the streets of Istanbul.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.