This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

Late Mesolithic settlements and Bronze Age burials have been excavated at this ancient woodland on the top of a hill.

Constructed during the 7th century this is one of the oldest largely intact Christian churches in England.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

France's most famous cemetery, with some of its most curious tombs.

Devilish masks, handicrafts, and pieces of old buildings create a snapshot of life in a historic Alpine region.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The Habsburgs' royal collections of art and wonders.

The beautiful baroque library of the Hapsburg empire.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

Giant marble phalluses on the sacred island of antiquity.