A lush indoor jungle fills this bustling Madrid transportation hub.

A Spanish town built into the cliffs.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Bacteria and algae give the salty water its bubblegum hue.

Eccentric sculpture garden brings Basque mythology to life.

An isolated village literally built into the crevices and rock formations of a mountain.

A Spanish forest is filled with mysterious stone carvings.

This whimsical winery by Antoni Gaudí looks ripped from the pages of a fairytale.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

Turntable anonymously received orphans, alms, and groceries.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

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

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This semi-secret storybook hedge maze is also the oldest garden in the city.