The oldest operating pharmacy in the world features 800-year-old recipes.

The middle finger of modernity.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

One philanthropist's extensive collection of knick-knacks and curiosities is now a public museum of oddity.

These eerie outliers of the lightning bug family glow a mysterious blue color.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

This Funeral Hearse Museum represents the finest in cadaver transportation.

A temple to modernity, tucked away amid Barcelona's more well known museums.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Week-long block party becomes a competition for the best decorated street.

This cemetery features modernist statues as strange as its name.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This lucky bronze frog was gifted to Madrid by a casino.

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

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

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

The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

Unlock the secrets of the conjuring arts.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.