Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

The only recreation of William Shakespeare's indoor playhouse.

A historic coal mine that doubles as a museum and tourist attraction.

America's post-nuclear-attack chambers of Congress.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.