The patch of land below the memorial was gifted by the British to the United States.

One of the oldest trees in Britain may have been witness to some of the country's formative moments.

Eclectic final resting place of the controversial explorer.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

It is against the law to obstruct the view from the top of this English burial mound.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

The oldest working mechanical clock in the world.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

A hands-off space for graffiti artists to hone and display their skills.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Scattered throughout London are ancient remnants of the city's former bounding wall.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This one has sailed five times as far as Sir Francis Drake's famous ship.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

This modest plaza in Moneygall, Ireland has cashed in on its distant connection to the U.S. president.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The oldest public library in Ireland.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

England's largest white horse isn't even white.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

The first custom-designed building to showcase the works of Dale Chihuly is a wonderland of glass and light.