Both panoramas are located in Europe: One is the worlds biggest panorama, depicting the city of Dresden, totalling 26 Gigapixels ( 297.500 x 87.500 pixels) It concists of 1.655 pictures and it took the pano-robot 172 minutes to finish! The other one, a spherical panorama was taken in Prague, and it  is 192,000 pixels wide and 96,000 pixels tall giving us a total of 18.4 Gigapixels. Link for the Prague panorama, and some details about how it was made. Link for the Dresden panorama