An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

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

This 19th-century fountain's namesake animal isn't what you think it is.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

The oldest known university in the world is in Fez, Morocco.

Crumbling necropolis set high above Fez.

The other side is actually green.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

A surreal statue honoring Prague's favorite literary son.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

A fearsome dragon clings to a corner of Munich's city hall.