A great list of 200 classic adventures.
The list on the site goes up to 1983 only. As the creator says, "Why does my Top Adventures List project stop in 1983? I figure that adventure fans already know which adventure novels from the Eighties, Nineties, and Twenty-Oughts are worth reading; so I'm interested in directing attention to older, sometimes obscure or forgotten adventures. Also, I have friends who've published adventures since 1983 — and I don't want these lists to be biased!"
The list only has 199 entries, though, and counts one book twice. I tracked down two other books he marked as being on this list on other pages but that don't actually appear on the main list and added them :) (The Most Dangerous Game and The Night Mail, if you're curious.) The original web page has a TON of additional best-of classic adventure lists; I highly recommend checking it out.