Subcategories of 1, sites that aren't there any more. When you look for them, you find:

Sites that return giant 404s.

Sites that return ad pages for the hosting vendor.

Sites that suggest possibilities that "you might like/want instead," which are invariably hilariously off.

Sites that have become pr0n vendors.

And a subcategory of the last, sites that have become pr0n vendors that proliferate popunders.

All these: go look for the original site in the Internet Archive.