This one-time health resort was used by aristocrats around the world.

A 16th-century Andalusian palace.

This little museum in the town where zombies were born celebrates the living dead.

There aren't too many operational funiculars around, but Pittsburgh has two!

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The world's brightest bioluminescent bay.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

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

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

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

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

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

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

This massive subterranean fissure is known as the "underground Grand Canyon."

A collection of haunted objects and macabre oddities under one roof.

Elevated freight railway turned wildly successful urban park.

Scenic mount trashmore, Virginia Beach's most curious waterfront still has a couple of secrets.

This old-fashioned carhop restaurant gave the world the waffle cone.

One tiny triangular park commemorates the victims of a yellow fever epidemic—many of whom are buried right below the grass.