[Lawtan]

Oh, and also a German in-depth fanfiction-wiki site.
Contains: Firefly, Shadowrun, etc.

Edit: Okay, today is old website day!
Make a GIF Party!
Wayback Machine and Old Web Browsers unite!
OOcities (Geocities frozen in Carbonite
Database of Still-working pre-2005 Websites

(Included/found from the above)
Klingon
Gallery of Interactive Geometry
Mathematics Journal K-Theory
Duke's Hypertext of Egyptian Papyrus


...not old, but 3D Printing Public Domain Designs