The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

A sculpture outside London's oldest cathedral honors the Mohegan chief who died while petitioning the king.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A plaque marks the underground site of one of London's "lost rivers."

The Art Deco artwork depicts gilded carriers of deadly illnesses.

London's old-school healing garden.

Hackney's newest private museum and natural curiosity shop.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

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

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

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The Egyptian-inspired last resting place of Lord Kilmorey.

Eclectic final resting place of the controversial explorer.

A historic arboretum and non-conformist, non-denominational park cemetery.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

One of the world's oldest fossil exhibits is on display in a beautiful antique "naturalienkabinett."

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.