An over-stuffed walrus and a merman
Marvel at a bloated walrus at Horniman Museum. Weighing just under one tonne, it was famously overstuffed by its Victorian taxidermist who is thought to have never seen such an animal. Other odd displays include giant musical instruments such as a xylophone wall, and a creepy-looking merman.
The smallest police station in London
Head to Trafalgar Square and you'll find the smallest police station in London (some say, the world). Cunningly built into a lamp post, this tiny cubby was just big enough for one policeman and was designed as a way of keeping an eye on demonstrations in the square.
A sham bridge
Look at a bridge by the Thousand Pound Pond in Kenwood House (within Hampstead Heath), and at first glance it appears perfectly normal. But view it from the side and you realise the bridge is totally fake! This strange folly was built in the mid 1700s, when the grounds belonged to the first Earl of Mansfield.
A jar of tweeting moles
Gaze at a glass jar of 18 moles, just one of the fantastically bizarre exhibits at the Grant Museum of Zoology. The moles even have their own Twitter account @glassjarofmoles. One of the UK's oldest natural history collections, this quirky London museum homes more than 1,000 species of rare and extinct animals.
The Seven Noses of Soho
Victorian surgical instruments
Discover a gruesome history of surgery at the The Old Operating Theatre Museum & Herb Garrett, one of London's more unusual medical museums. Rediscovered in 1956, this 19th-century operating theatre in the roof of an English Baroque Church examines what surgery was like in the pre-anaesthetic and antibiotics era.
A giant squid
Spot a monstrous giant squid at the Natural History Museum's Zoology Spirit building. Caught in 2004, the 8.62m-long (28ft) giant squid is among a collection that also includes Darwin's pet tortoise and the conserved skeleton of a whale that swam up the river Thames. Tours of the Spirit Collection are free, but must be booked in advance.
Step into the basement of cocktail bar The Last Tuesday Society and you’ll discover a world influenced by pre-Enlightenment wonder at The Viktor Wynd Museum of Curiosities. Uncover everything from a collection of McDonald’s Happy Meal toys, to two-headed kittens, dodo bones and a stuffed lion seated at a table.
Clown around at the quirky London Clowns' Gallery in Dalston, which displays sculptures, masks and curios dedicated to the entertainers. Look out for eggs that have been painted with portraits of Clowns International members. Pop in when it’s open on the first Friday of every month.
An artist's House of Dreams
Walk into the weird and wonderful world of artist Stephen Wright at his house and gardens in East Dulwich. This secret London hidden gem is crammed full of his own work and collections, which range from dental moulds to masks and dolls’ heads. It's only open on selected days throughout the year.
Venture beneath the woods in Chislehurst to a labyrinth of man-made caves. Created when chalk and flint were dug from the ground from the 13th century onwards, the Chislehurst Caves have been a place of smuggling, murder, a wartime munitions store and air raid shelter, plus a latter-day concert venue.