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.
Here we are in Cividale del Friuli, a nice little town in east Friuli, Italy. You're looking at an historical commemoration about the Palio of San Donato: it was a competition between the five town districts at the presence of Marquardo von Randek, patriarch of Aquileia. It consists of several "games" like archery, crossbow and axes, pedestrian races and other competitions. Here you can see some guys, wearing historical dresses dancing, and you can hear too (also if the quality is no so good) medieval music played by street musicians. In August, for the patron saint of the town, San Donato, we have this historical reenactment.