Step into the cool deep past and unknown future of who begat who.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

Where the U.S. government kept its actual treasure, before Fort Knox.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

More gold than anywhere else, ever.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

Japanese island famous for poison gas and fluffy bunnies.

Wallabies live naturally on this Irish island.

Cave where bat-eating snakes hang down from the ceiling.

Morocco's Argania trees are infested with nut-hungry goats.

The site of a classic series of Laurel and Hardy pratfalls.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Stairs often replace streets on the steep slopes of this old mining town.

A stairway to heaven, or to nowhere at all.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

An artsy hidden staircase leads to breathtaking views of San Francisco.

The site of the climactic scene from the classic horror film is now a historic landmark.

Bug-devouring flora are the stars of a special wing of the glass conservatory.

A bigger-than-life pun that has become a beacon of altruism.

Rusty industrial city full of oxidized distillation towers.

Where the rich wintered in Pasadena.

Some of the most unusual (and in some cases, disgusting) flavors of soda imaginable.