Last month, we showed you an interactive, high-res image taken from the top of the world's tallest building, the Burj Khalifa in Dubai. That image was huge — 2.5 gigapixels. Now there's an even bigger gigapixel image, a 360-degree panoramic photo of London that comes in at a record 320-gigapixel resolution.

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The image was commissioned by British Telecommunications, who hired 360Cities, the same company responsible for the interactive self-portrait panorama of NASA's Mars Curiosity Rover.

Interact with Panoramic Pic from Tallest Building

The panorama was created by installing four cameras around the outside platform of the 29th floor of the British Telecommunications tower. The cameras were then attached to robotic mounts timed to take four frames a second. It took three days to snap the images and three months for a computer program to stitch together all 48,640 individual shots.

To view the image, visit BT's website.