Oldest cache of assorted types as far as I know. Types were invented after the caches had existed for a while, and cache owners were able to change types, so determining first for each type is a confused exercise.
Originally, all caches were listed as Geocache.
May 7, 2001, Jeremy added cache types. See this forum thread, Cache Types
(visit link)
Created at that time:
Traditional, Multi-cache, Letterbox hybrid, Virtual, Unknown, Event
Also in May 01, A.P.E. caches, then Webcams (Jan or Feb 02), Locationless (4/02), CITO events (4/03), Earthcaches (1/04), MEGA event (5/06), GPS Maze (6/07), Wherigo (1/08), 10 Year Events (5/10), and special HQ cache and HQ event icons.
Good info in this Oct 04 forum thread
(visit link)
About Bookmark Lists
A bookmark list is a user defined collection of listings. They can be used as to
do lists, watch lists, a way to organize listings you find, or whatever you decide.
You can keep them private or share them with others.
Bookmarks can be added on the page for the listing or on this page using the waypoint
name.
Bookmark names may be different than the actual listing. Click on the listings to
see the actual names.