This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Japanese island famous for poison gas and fluffy bunnies.

Be(w)ar(e) the moat around this historic Czech castle.

The USSR’s Conquest of Nature lead to the domestication of many moose—no squirrel.

Some of the world's only freshwater seals live in one very special lake in Russia.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Con Edison’s exotic and heat-loving pests.

4,000 monkeys used for medical testing on an island off of South Carolina.

Giant, friendly pelicans in Central London, the most unlikely of places.

An eccentric aristocrat brought these Australian natives to their current Scottish home.

In paradise, feral pigs have claimed an island all to themselves.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

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.

This golfball sized platinum iridium cylinder is the official starting point for all national weight calibrations

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.

Over 9,000 brains collected between 1945 and 1982 demonstrate the results of untreated mental illness.

A collection of 100 brains preserved in jars on the UT campus.

This collection started by a Cornell professor once held more than 600 human brain specimens, including the one that belonged to its founder.