Marie writes: the ability to explore an image in 360 degrees is nothing new, but that doesn't make these pictures any less cool. In the first of a series, the Observer's architecture critic Rowan Moore introduces spectacular interactive 360-degree panoramic photographs of Britain's architectural wonders. "You are put in the middle of a space, and using your computer mouse or dragging your iPad screen - you can look in any direction you choose: up, down, sideways, diagonally, in any direction in full 360 degree turn, in three dimensions."

Go here to explore St Paul's Cathedral, London, built 1675-1711.

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