Murals of the wild parties once held on the frozen River Thames.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

Over several decades, one of London’s most iconic city gates was dismantled, moved out of the city, and then moved back.

The cedar tree in Highgate Cemetery earned its title by accident.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

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

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

These 19th-century gas tanks were remade into an apartment complex.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Public access to clean drinking water was an instant hit among the masses.

A Jenga-style cylindrical tower of books that appears to go on forever.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

Nine bronze hands protruding from a wall honor the student uprising that led to the fall of Czechoslovakia's Communist government.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Be(w)ar(e) the moat around this historic Czech castle.

Macabre astrological automaton clock dating to the late 1400s.

This automated sculpture of two men peeing will spell out text messages with their micturition.