Strange masks and obscure costumes are housed in this old Madrid corrala.

This small museum tucked within a subway station holds pieces from Madrid's past.

The oldest vestiges of Madrid found here, have been incorporated into this new museum.

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

Inaugurated three times, this tower offers some of the best views of Madrid.

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

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.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

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

A thorough look at the development and history of the underground's rolling stock of the Madrid subway system.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

The anatomical-pathological collection of a man who changed surgery.

A cluttered and astounding collection of antiquities and curiosities.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

Its collection includes a broad array of social, geographic, graphic design, and political history.

The world's oldest optical museum is an odd collection where the exhibits look at you.

This coffee shop lies hidden beneath a historic church.

London's smallest police station is barely the size of a phone booth.

A quartet of tiled art pieces adorn the floors of this prestigious art museum.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.