Once the home of a hermetic monk, this cave now houses a small church.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Hamburgers are intensely proud of their tunnel beneath the river.