The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

Legend says this sacred tree was a gift from goddess Athena.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

A Florida college boasts the world's largest single-site collection of structures designed by Frank Lloyd Wright.

A building so large that it has its own weather.

A tribute to Ponce de Leon's supposed quest for eternal youth.

A sprawling maze of used books piled from floor to ceiling.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

The most loyal of little dogs, or a Victorian era publicity stunt?

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

The modern birthplace of Irish freedom.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This World War II relic let Allied pilots know they were entering neutral airspace.

A retired military stronghold on the rolling green coast of Donegal.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

These murals stand as reminders to the troubled history of this Northern Ireland city.