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.
On 22nd September was European "No Car Day". Ljubljana downtown was closed for cars - only one day but what a joy to walk! Cars emit high percentage of greenhouse gases, so the European Commission has signed voluntary agreements with the automotive industry to reduce the emissions of carbon dioxide (CO2) to control greenhouse gas emissions from the transportation sector. Alternative way is railway transportation. First train drove to Ljubljana on September 16th, 1849.
In a distance is a train with the panoramas along the composition. High resolution panoramas sticked on the train represent Slovenian landscapes East to West Slovenia.
Oh... yes - there is another alternative of tranportation - bikes !!! (I prefere footing...)