A collection of machines designed to break things for science.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

The commemorative stone column conceals a secret laboratory.

The fences outside some of South London's estates are made from recycled World War II stretchers.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

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

A historic hill of tall tales, with one rather special tree.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

An enigmatic modern marker left next to a historic Roman site.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

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

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

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

The broken skateboards that became a poignant memorial to a murdered skater.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

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

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

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

A Roman spa buried deep beneath the City of London.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

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

A famous burial ground with a history both grim and literary.

London's largest outsider art museum.