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.

Wallabies live naturally on this Irish island.

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

The U.S. Fish Commission’s effort to mass produce carp.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

The only tennis court that falls under the jurisdiction of the central bank.

D.C. once had its own tiny rival to the New York Stock Exchange.

A memorial to a shareholder activist feared by CEOs around the United States.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

This grisly headstone doesn’t seem to be resting in peace.

An ear-piercing buzzer calls lawmakers to a vote with a series of long and short rings to form coded messages.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An overlooked memorial honoring the local Washington residents who died in World War I.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

A line of blue paint marks the route of the inaugural parade.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

The national park was once a plantation estate.