Scattered throughout London are ancient remnants of the city's former bounding wall.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

A memorial for public executions that dates back to the 14th century.

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

Originally meant to hold a statue of King William IV, this support sat empty for years. Today, it hosts a rotating cast of public artwork.

The Great Fire of London and the regulation of one-way streets both started in this alley.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

This mysterious and unique painting is filled with symbolism.

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

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

The broken skateboards that became a poignant memorial to a murdered skater.

The commemorative stone column conceals a secret laboratory.

An architectural oddity hides in plain sight on this iconic London bridge.

Ship-sized kinetic sculptural fantasy.

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

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

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

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

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

A naturally mummified 2,000-year-old man.

Giant, friendly pelicans in Central London, the most unlikely of places.