Interesting fact I just learned:

If you go to https://web.archive.org/web/20061229010703/http://www.roblox.com/User.aspx?ID=1, and replace 1 with 2, then 2 with 3, and one last time to 4, you will be taken to the 2006 website, the 2011 website, the 2015 website, and the 2020 website for roblox.