The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

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

These docile dragons are ideal inhabitants for the conservatory greenhouses.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

A collection of machines designed to break things for science.

The world’s largest magazine collection was born from a single shelf in a teen’s bedroom.

The commemorative stone column conceals a secret laboratory.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

A boutique perfumery fashioned to look like a Victorian-era shop.

This knockout museum lies in a sleepy corner of London.

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

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The canine-themed book collection claims to be Europe's largest dog library.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

These ornate arches show how the course of the River Thames has changed.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.