A small stone monument marks the spot on Stavely Road where the first of hundreds of missiles touched down during World War II.

This hydraulic power system in London was, at one time, seen as a rival to electricity and the last of its kind to shut down.

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

On a wall in linear London, a plaque hangs at the high water mark of one of the worst floods in fictional Kcymaerxthaereal times.

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

These morbid carvings remind churchgoers of the inevitability of death.

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.

A historic arboretum and non-conformist, non-denominational park cemetery.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A small town hallucinates en masse - Bad bread, or CIA science project?

A veritable variety of odds and ends.

Some of the best Persian food in New York comes from the front window of an unassuming pizza shop.

A playground the size of a city block is a modernist monument to civic values and public housing.

A mysterious statue of a leather jacket-clad rebel leans coolly on an odd yellow clock.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

A beautiful collection of architectural ornaments rescued from demolished New York City buildings.

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

Inside this unique festival hall, a slide leads guests down to a subterranean watering hole.

This simple apartment may have inspired some of the most important theories in the history of science.

A 13th-century Swiss castle houses a collection of artifacts from the Polish diaspora.

Europe's largest dinosaur museum was founded by a passionate autodidact.

This eclectic architectural gem played witness to Zurich’s colonial past.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.