A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

This spooky statue sits outside a famous Prague theater.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Macabre astrological automaton clock dating to the late 1400s.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

A Neolithic celestial calendar standing in a nondescript wheat field.