A mysterious shape catches the eye in this 16th-century painting.

It celebrates a very stinky task and salutes London's fatberg-vanquishing team.

The largest greenhouse in the world is home to over one million types of plants.

A faded reminder of what was once a common sight in London during the Blitz.

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

The fences outside some of South London's estates are made from recycled World War II stretchers.

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

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

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

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

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

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

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

The television series' iconic giant foot was borrowed from this classical painting.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Hear the quietest sound from across the dome.

Walk through depictions of the torture inflicted on those who go to Buddhist hell.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

Dictionary Johnson’s favorite feline.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The encased skull that is widely believed to belong to St. John the Baptist.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.