A sweet symbol marks the place where torturous executions were once carried out.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

The second oldest Jewish graveyard in the U.S. is tiny, with connections to George Washington and Henry Wadsworth Longfellow.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

The largest portal tomb in Europe has a capstone weighing around 150 tons.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

St. Augustine's record-setting narrow street was designed to protect against pirates.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

Herbert Hoover's "Brown House" rural presidential retreat was a PR disaster amid the start of the Great Depression.

An 11th-century fortress home to one of the most influential royal houses in medieval Europe.

The profile of one ill-fated deacon was emblazoned forever on this church window during the Halifax explosion.

Once America’s most beautiful army base, this abandoned military fort on the coast of Monterey Bay has been left to the elements.

The romance of early commercial flight still fills this Art Deco destination.

The oldest continuously operating fish market in the United States.

Built by the patriotic residents of Boonsboro in a single day.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

A daily replay of the experiment that proved the rotation of the Earth.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.