This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Palace where the nearly un-killable Rasputin was murdered.

One of the largest caves in the world open to the public.

Pilgrimage site for star-crossed lovers.

Go inside to really appreciate this 500-year-old technological masterpiece.

The oldest operating pharmacy in the world features 800-year-old recipes.

Iceland's tribute to its thankless civil servants.

This stunning concert hall has become a symbol of Iceland's national recovery.

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

In between two buildings in Ljubljana, medieval tunnel to nowhere.

A public work of art that also provides some relief from the summer heat.

Strange rumors surround the artist who created these solemn metal guard dogs.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

Macabre museum devoted to historical Viennese murders.

Museum preserving torture methods from the past.

Europe's official "zero-level," the equator of elevation.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.