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

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

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

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

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

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

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

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

A larger-than-life statue of the German revolutionist stands proud in a small town where he never lived.

Two stunning 17th-century libraries and a cabinet of curiosities.

An existential riddle in the world's largest ancient castle.

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

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A surreal statue honoring Prague's favorite literary son.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Monument to a suicide protesting the Soviet invasion.

A little sculpture with a large wardrobe.

An ancient Egyptian temple in the middle of Madrid, Spain.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

In the middle of a desert subdivision, there is supposedly an impact crater site from Kcymaerxthaereal times.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.