An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

The world's oldest bookshop still in operation.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This hidden art nouveau gem was designed by an architect in search of a national style.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

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

Electrical curiosity museum housed in an old transformer station.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.