The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A bronze bust commemorates the heroism of the secret agents who led covert operations against the Nazis.

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

At this small museum, visitors can view artifacts from the only battlefield in London during the War of the Roses.

The commemorative stone column conceals a secret laboratory.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A tribute to an explorer and naturalist often overlooked by history.

A mysterious shape catches the eye in this 16th-century painting.

This Puget Sound military post has a long, turbulent history as a gateway to the Pacific.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

A giant scrawl on the skyline of south London.

A relic of Victorian grandeur hides beneath a busy South London road.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

A seaside town with no sea in sight.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

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.