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

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

London's largest outsider art museum.

A historic house left in "dramatic still life."

Rebuilt remains of a temple to Roman god Mithras.

Explore nearly 400 years of English middle-class home life.

A mysterious artist-run cabinet of curiosities and library.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

This hidden rooftop garden in downtown London offers a quiet respite from a bustling city.