This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A barbarous band of serpents guard the bases of these Aztec temples.

Mexico City's largest market contains a Willy Wonka-esque wonderland.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

A scientific repository of goiters, boils and other ailments throughout Mexican history.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

When the plague struck York, this stone was used to leave supplies for the sick.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This disused Cold War bunker has been restored to all of its early 60s glory.

This network of narrow, medieval passages has the most delightful name.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

19th century museum with an eclectic mix of curiosities, from Egyptian artifacts to items on archery history to the skull of the world's oldest horse.

Have a seat with the father of modern computing at this Manchester monument.

The graveyard with the highest IQ in Britain.

A complicated contraption for telling time by the moon.

Vast fan-shaped British cemetery honouring American servicemen lost in World War II.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

This memorial to the thousands of Indian dead during WWI was callously used for target practice during WWII.