The Victoria-era quarantine station for Sydney.

The bullet-banged DIY suit of armour belonging to Australia’s most famous outlaw.

Come for the flowers, stay for the bats!

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A clear example of the process of erosion in action.

This salad has two key ingredients: hearts of palm and green ice cream.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

A secret greenspace hides atop a Capitol parking garage.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The tunnel under the Capitol Building where Congress takes out its trash.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

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

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

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

A portal into the bricked up canal that runs through the heart of Washington D.C.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

A much-maligned monument to teetotalism.

Washington's iconic carousel has a nice piece of Civil Rights history.