The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

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

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

Museum about life, death, and cannibalism in the Stone Age.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

Museum celebrating the history of computers, especially their role in codebreaking.

Fantastically decorated underground chambers built in the 1760s.

An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

This stately estate house features a tower covered in a bright, modern mural.