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

No one is sure what to do with this WWII shipwreck that sits at the bottom of the Thames, still loaded with tons of explosives.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

360° views of the city plus five floors of optical illusions and hands-on science.