1. Organization pages contain links one can use to jump directly to a site.
2. The Vis system URLs are structured in a way that you can jump directly to a site if you know the SiteID: https://vis.globe.gov/GLOBE/?site_id=32534
You can replace the SiteID number 32534 at the end of the URL after the = sign with any valid SiteID and Vis will show the data at that site to you. If you don't know the SiteID, you can always use the filters in Vis for various searching options that will help you find whatever site you need.