A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

This cul-de-sac off Fleet Street is said to be the place where the infamous Demon Barber made a killing

The (fictional) address of Sweeney Todd's bloody barbershop.

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

Hidden beneath the streets of London is a secret subway that only carried mail.

England's most famous front door has an accidental doppelganger.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Preserved behind glass, the ruins of a medieval building used to store human remains.

A living lighting fixture.

This museum inside a museum tells the story of London's timepieces.

Charles Babbage's proto-computer, painstakingly brought to life.

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

This ancient spring in central London was featured in a Peter Pan story.

A haunting painting meant to capture the calamity of World War I.

A living memorial to the trees London lost during the Great Storm of 1987.

An agreement meant to honor the Duke of Buckingham led to this unusually-named passageway near Charing Cross.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

The world's largest wooden structure.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

A small statue commemorates a centuries-old event that still hangs over the people of Leuven.

A tiny metropolis resides inside this student housing complex.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

A monumental toilet that is also host to rare plants.