The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

According to tradition, King Phillip II supervised construction of the seat of his empire from this seat carved into rock.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

The morbid items in this small and hidden museum are not for the weak stomached.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

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

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

A private museum dedicated to preserving the heritage of Mardi Gras' most beloved underdog parades, open by appointment.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

Imagine playing a version of Legends of the Hidden Temple, but with a distinctly Southern Gothic flare.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

The second oldest continuously operating bar in Louisiana.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Site of a former hidden treehouse in New Orleans.

A snapshot of the city's fascinating voodoo culture.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.