most (not all, some contributions are QTVR-only due to historical reasons)
Javascript + HTML5 / WebGL
many, but depends on photographer's choice of file upload (newer event = more likely to work) and your device's capabilities. You may experience slow playback, distorted images or unexpected browser quitting if there is only limited memory/GPU power available.
Cement mill in Grodziec started in year 1857 (closed in 1979). It was first cement mill in Poland and fifth on the world. Cement mill in Grodziec on Wikipedia
Geographic Coordinates:
Latitude: 50° 21' 12.45" N
Longitude: 19° 5' 8.72" E
Precision is: High. Pinpoints the exact spot.