A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.

The famous polar explorer stands outside the Royal Geographical Society's headquarters.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

The pockmarks across the building's facade are remnants of the Blitz.

The British monarchy's stamp collection is one of the most impressive in all of Europe revealing generations of royal nerdery.

This museum inside a museum tells the story of London's timepieces.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

The remains of the great moral philosopher reside in a university in London.

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

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

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

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

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.

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

The curios of pharmacist and collector Henry Wellcome.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

The oldest public library in Ireland.