An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The world's largest vertical wind tunnel.

The world's largest fully steerable radio telescope.

The only recreation of William Shakespeare's indoor playhouse.

Exact replica of the ancient monument, but much, much lighter.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Fine dining in the bizarre world of Lewis Carroll.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

The world's first museum dedicated to the work of game-changing naturalist Charles Darwin.