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

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Bacteria and algae give the salty water its bubblegum hue.

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

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

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

One of the first sewers in the Americas.

Built in 1512, the oldest cathedral in the Americas.

A collection cataloguing one of the most brutal dictatorships in modern history.

Learn the history of Dominican rum production.

The first hospital in the New World.

Collection of fossils, plants, and ancient animals encased in amber.

An eccentric German artist built this weird and wondrous castle packed with shocking sculptures and alien art.

Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

Renowned restaurant tucked in a cave once occupied by buccaneers.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.