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

Three small rooms at the back of the “official” church of London's clowns.

Chelsea's soldiers were given strict orders when crossing this historic bridge.

A domino effect created with Britain’s iconic telephone boxes.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

These morbid carvings remind churchgoers of the inevitability of death.

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

An artistic tribute to the famous singer, just around the corner from where he was born.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

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

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

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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.

A kaleidoscopic warehouse-maze of handmade neon signs.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

A mocking tribute to the past and modern leadership of Prague.

An eerie, existential museum dedicated to the author of "The Metamorphosis."