The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Macabre astrological automaton clock dating to the late 1400s.

A collection of intricate sculptures so small they have to be seen through a microscope.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The history of Greece is illustrated through banknotes.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.