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

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

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

These morbid carvings remind churchgoers of the inevitability of death.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

This one has sailed five times as far as Sir Francis Drake's famous ship.

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

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

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Where condemned pirates met their grisly end at the gallows on the River Thames.

The secret wartime bunker built on the platforms of an abandoned Tube station.

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

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

This small collection of rare books was uniquely locked up for safe keeping.

The remains of the great moral philosopher reside in a university in London.

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

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

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

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

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

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

There's an exclusive Beefeaters pub hidden in the Tower of London.