Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

Christ's blood preserved in a Belgian town.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This Transylvanian church has changed its denomination four times.

The Natural History Museum that time forgot.

The world’s first statue of the late Apple co-founder.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

The great Danube river starts here.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

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

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

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

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

Hungarian self-built castle.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.