The oldest garden in Prague, once part of an medieval orchard.

A Jenga-style cylindrical tower of books that appears to go on forever.

Looming communist pillar with a Czech twist.

Two stunning 17th-century libraries and a cabinet of curiosities.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

Four-story slides send people whizzing through the math department at this Munich university.

This wooden hotel is a temple to German sustainability and forest conservation.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

This historic little railroad runs through some of the most beautiful scenery in Germany.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

A former Nazi lookout tower with a magnificent view of the Rhineland.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

There are two dozen tanks just sitting in an open field in Lower Saxony.

Crop circles inspired this whimsical garden in Germany.

This riverside restaurant has been serving customers since 1146.

The largest brick bridge in the world.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

The last bastion of Roman presence north of the Alps looms over a German town.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

An abandoned swimming pool decays on the outskirts of Berlin.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.