A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The celebrated eyesore created by starry-eyed sweethearts.

Brussels' favorite peeing boy has a sister.

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

Northern Ireland's Brobdingnagian stepping stones.

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

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

World's first "penitentiary," meant to be humane, drove men insane.

The Liverpool street made famous by the Beatles is real.

The quiet field that inspired one of the most famous songs of all time.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

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

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

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

One of Ireland's most infamous prisons for rebels including men, women and children.