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

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

The commemorative stone column conceals a secret laboratory.

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A lawless town deep in Death Valley was famous for its riches and death rate turned YouTube famous.

A museum preserving one company’s history of preserving food.

On a wall in Cleveland, Ohio find the story of a highly connected fictional community of organisms that created remarkable, lasting structures.

A geothermal energy project gone wrong is fracturing the city's picturesque architecture.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.