Go go the page of the forum you want to explore.
I'll use the Main forum as an example.
Look up at the URL in the address bar:
It looks like this:
http://www.quiltingboard.com/s-1-1.htm
See the
1-1 towards the end?
The first
1 indicates the Main board.
The second
1 relates to the page number.
So if you change that to 500 (so it reads 1-500) it will take you to the 500th page of the Main forum.
http://www.quiltingboard.com/s-1-500.htm
Pictures is forum #
5.
So this url will get you to the 500th page of the Pictures forum.
http://www.quiltingboard.com/s-5-500.htm
You just have to go to the first page of each forum, and then edit the page number you want.
But keep in mind that if you come back in a few days, the info on page 500 you viewed today will likely be on page 504+ by then.