The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Medicinal spa created with the discharge from a geothermal energy plant.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Legend has it this fountain built to symbolize the Pope’s power hides a strange secret concerning Neptune's manliness.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

The bones of some 7,000 soldiers killed in the historic Battle of Solferino are stored here.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Europe’s oldest natural human mummy.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Pilgrimage site for star-crossed lovers.

Five candy-colored villages on the Italian Riviera.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

Metro station with a claim to rock n' roll fame.

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

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.