These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The walls of these four caverns are filled with art that dates back to the earliest human presence in Europe.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

This influential Renaissance-era library was once the haunt of kings and monks.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

A "haunted" landmark on the coast of Southern California.

This monster board rode a monster wave to break two world records.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Former villa and estate of James Deering developed to preserve native tropical forests.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A building so large that it has its own weather.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

Who knew the Devil's domain was a hot spot for tubing?