Record-breaking 320-gigapixel panorama of London is a cause for celebration, vertigo

While the Shard might be the new darling of London's skyline, the BT Tower's still got a few tricks up its sleeve -- such as this record-breaking 320 gigapixel panorama of the English capital. In total 48,640 images, shot with four Canon EOS 7D cameras were stitched together to create this 360 vista. Want a little more perspective? It's said that if this were a physical image, it would be almost as large as Buckingham Palace -- or if you prefer -- 60,000 times larger than an average iPhone photo...