A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

The bronze uniforms commemorate the vital role of women during World War II.

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

A museum wholly devoted to juvenescence.

The Columbia Road Flower Market is now open every Sunday, rain or shine.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

The remains of Crystal Palace Great Exhibition of 1851.

Catacombs turned marketplace.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

This restaurant's marvelous musical machines include a self-playing violin.

A 1920s speakeasy that had rum runners racing up and down the shores of California.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

A giant scrawl on the skyline of south London.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

Only hotel where you can legally launder money.

The grand, column-fronted, sculpture-adorned home of the ambitious digital library.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

The miraculous hydrant that saved the Mission District in 1906.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.