The first integrated firehouse in Atlanta houses a museum on the history of desegregation in the city's fire department.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

The highway's southernmost spot is a beloved local attraction.

The commemorative stone column conceals a secret laboratory.

The plunge pool is a surviving relic of a rowdy royal residence.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Pop culture has helped to keep this iconic British building from being destroyed.

A naturally mummified 2,000-year-old man.

Catacombs turned marketplace.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

The sculpture of the deceased cockatoo flops atop its personal plinth.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

This studio was home to David Bowie's first single, even if it did turn away the Beatles.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

These docile dragons are ideal inhabitants for the conservatory greenhouses.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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

London's smallest police station is barely the size of a phone booth.