One of the figures in this Celtic sculpture continues to puzzle archaeologists.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

It's a mystery why these remains were found with no traces of their bodies in sight.

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

A quiet memorial to those who died saving others in the heart of the City of London.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

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

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

On the eve of a condemned prisoner's death, this bell rang 12 times outside their cell.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

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.

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."

This historic building displays the remains of a victim of the devastating 14th-century plague.

This hidden green space is the city's second largest conservatory.

This may be the last of London's wooden pavements, which were once a common sight in the city.

A famous burial ground with a history both grim and literary.

This religious museum resides in a church crypt next to the founder's house.

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

This macabre painting of a Shakespearean scene looks like something out of a nightmare.

This mysterious and unique painting is filled with symbolism.

A haunting painting meant to capture the calamity of World War I.

This haunting sculpture was created as a statement on the mechanized warfare of the First World War.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.