A statuesque figure of a feline stands sentry over a ostentatious spiral staircase

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

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

This plaque in one of London's oldest public hospitals commemorates the first meeting of two of Britain's most famous literary heroes: Sherlock Holmes and Dr. Watson.

A lone medieval church tower marooned among the City of London's skyscrapers

At Bank station, the tunneling shield that built the original Waterloo & City line tunnel is hiding in plain sight

The ground on which Shakespeare’s initial playhouse once stood.

The ruins of a once-mighty medieval palace are hidden away in otherwise modern London

One of the four clock faces on this church is mismatched, in a nod to a historic slight.

Closing the station left a big hole in the ground. So they put in a shopping centre, a block of apartments and bus station over it and the largest undercover car park Europe in it.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

The oldest inn in England served brew to the crusaders.

The English Civil War began right here in 1642.

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

A bronze statue of a low three-legged seat commemorates a piece of furniture that started a riot.

Dedicated to the Father of the British Fire Service.

A rare example of one of the world's first printed books

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

This early version of the guillotine was used to execute the man responsible for its construction.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.