It's not actually a 2.5 gigapixel picture it's a montage of 100s, you can zoom in for miles, it doesn't take that long to load as it loads each zoom seperately.
Not recommended for dialup users though
Fascinating
http://triton.tpd.tno.nl/gigazoom/Delft2.htm
Not recommended for dialup users though
Fascinating
http://triton.tpd.tno.nl/gigazoom/Delft2.htm