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

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

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

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

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

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

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

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

This overlooked street light once served as a KGB dead letter box.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.

Eclectic final resting place of the controversial explorer.

These morbid carvings remind churchgoers of the inevitability of death.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

Traveling collection of amazing automata.

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

A domino effect created with Britain’s iconic telephone boxes.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

Pop culture has helped to keep this iconic British building from being destroyed.

The monster at the center of the Darwin Center Spirit Collection.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

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

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

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.