A haven for book enthusiasts across the street from Retiro Park.

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

Known as the Casa de las Siete Chimeneas, this haunted 16th-century manor has a dark, mysterious past.

Once a resting spot for King Fernando VII.

The fragmented remains of a massive public bath connected to the city's water supply.

A pair of gigantic baby heads greet passengers at Atocha Station.

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

An archeological treasure trove stumbled upon by a couple of children.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

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

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

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

This cemetery features modernist statues as strange as its name.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

An otherworldly art experience.

The ruins of a 2,000-year-old Roman fishing village perched on one of the best beaches in Spain.

Spain's largest bullring offers a unique glimpse at architecture and history.

Single runway interrupted by a busy road that cuts across its middle.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

This centuries-old tower hosts endangered bald ibis mating pairs and looms over a pristine beach.

This massive redwood tree has a hole in the base big enough to drive through.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.