The childhood home of Earth's alien chameleon is a humble Brixton flat.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

Cat art as far as the eye can see.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

A floating cat sanctuary on an Amsterdam canal.

A unique collection of gilded age mechanical pianos.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

London's largest outsider art museum.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

Catacombs turned marketplace.

Black cat statues guard this temple-like Egyptian revival factory.

A network of concealed passageways lies within a busy London Underground station.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

This 1920s Dutch barge is now a floating bookstore.

Taxidermied animals galore, by appointment only.

A Roman spa buried deep beneath the City of London.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

A display of everyday life in the area that was unveiled during the 2012 Summer Olympics.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.