This is Lanyon Quoit, in Cornwall. Originally, part of a burial mound, the Quoit collapsed in a storm in 1815. It was rebuilt in 1824, but using only 3 uprights instead of the original 4.
I took this picture with my first ever digital camera - a Sony Mavica. It used 3.5 inch floppy disks, with a resolution of under half a megapixel - cutting edge but complete rubbish.