An unusual round church in London with a Templar past.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Crafted by one of the first makers of stoneware in England.

Hidden beneath the streets of London is a secret subway that only carried mail.

It’s fun to stay at the YMCA… but at this London outpost, it’s even more fun to eat the Bombay aloo.

A small museum that celebrates the history and culture of the LGBTQ community in England.

This unusually-named reservoir found a second life as a nature preserve.

Order bagels and lox from an iconic Jewish delicatessen with nearly a century of history behind it.

This black cat was actually designed to ward off bad luck.

London's largest outsider art museum.

This museum is dedicated solely to this millennia-old handheld cooling device.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

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

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

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

Legend has it that seven Anglo-Saxon kings were coronated on this stone, located in the appropriately-named town of Kingston.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

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

The world's oldest optical museum is an odd collection where the exhibits look at you.