Right next to departures—how convenient!

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

This church built atop a gas station promises to "equip you for the next stage in your life’s journey."

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The taxidermied remains of a once-great parrot.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Ship-sized kinetic sculptural fantasy.

Public access to clean drinking water was an instant hit among the masses.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Cat art as far as the eye can see.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

The span is crooked and made from two older recycled bridges.

It was once the base for a series of domestic terror attacks.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

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.

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

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