Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The world’s first museum dedicated to the history of childhood opened in Edinburgh in 1955.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

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

The surprising home of the iconic Santa Monica Pier Ferris Wheel.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

It reportedly took three years to sort through all the objects in this eclectic lifelong collection.

This Norwegian satellite station provides ground services to more satellites than any other facility in the world.

Instead of numerals, the unusual clock face spells out a memorial to a lost loved one.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

The small Scottish townhouse where the "Father of the National Parks" was born.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Meet the "Green Monster" of Monico, Wisconsin.

The castle still holds traces of the abandoned Roman fort it was built atop.

Grab a cuppa at England's first and only domestic tea plantation.

This kitschy tavern is also home to rare early editions of "Treasure Island."

This campus chapel is Robert E. Lee's final resting place and a topic of debate about the legacy of the Civil War.

America's post-nuclear-attack chambers of Congress.

The abandoned fishing village was swept right into the sea.

A half-size replica of the World Trade Center towers above Tulsa.

Elvis's own personal tropical hideaway.