The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

A rocky face gazes out over an enormous volcanic crater.

Bacteria and algae give the salty water its bubblegum hue.

The ruins of an ancient Celtiberian town with incredible rock-cut buildings and a Roman aqueduct.

This dreamy street will transport you to wintertime in Victorian England.

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

Hidden on the urban banks of a Manchester river are a series of abandoned waterside industrial sites.

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

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

San Francisco's newly reopened hands-on science museum.

The only theatre in the world constructed specifically for sound movement.