These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Eighty million natural history specimens call this gargantuan museum home.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

One of the world's earliest skyscrapers.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

This little dolphin is the first monument dedicated to the LGBTQ+ community in the southern United States.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

The second oldest continuously operating bar in Louisiana.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

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

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

An outstanding and haunting glimpse of the horrors of the Great Famine of Ireland.

This ancient Irish landscape boasts hundreds of legendary ruins.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

The ancient tomb acts as a calendar that keeps perfect time.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

This Neolithic passage tomb forms part of a World Heritage Site.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.