If you use a modern browser like current Firefox, Chrome, Opera or Safari versions (to name a few) you don't have to install the Flash plugin in order to see the time-lapse videos. The time-lapse video will now play on iPhone/iPod touch and iPad devices, too.
Should you use an older version of your browser or the Internet Explorer where HTML5 video support is not available, the time-lapse video playback falls back to the Flash plugin.
Here are some nice time-lapses:
La Tour Eiffel, France:
Positano, Italy:
Tokyo, Japan:
Check out more time-lapse videos.