An Austrian house of bones filled with hundreds of intricately painted skulls.

This "mathematical tower" was an observatory, early skyscraper, and place to reflect on all of nature and the cosmos.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.