A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

With its webbed walls and bright red coloring, Calgary's iconic bridge looks like a finger trap puzzle stretched across the river.

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

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

The Art Deco artwork depicts gilded carriers of deadly illnesses.

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

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

This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

This 11th century tower is said to be the oldest building in Oxford.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

This granite rock face is named for the magnificent reflection that occurs when the sun hits it just right.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

This nine-story building is the oldest standing skyscraper in D.C.

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

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

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

The fantastic charm of England's oldest botanical garden has made it a place of writerly inspiration for centuries.

The school tested mustard gas for the U.S. Army during World War I.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.