Oldest cache of assorted types as far as I know. Types were invented about a year in, and for a time, cache owners were could edit type, so determining first for each is a confused exercise.
Originally, all caches were listed as Geocache.
May 7, 2001, Jeremy added cache types. See this forum thread, Cache Types
Created at that time:
Traditional, Multi-cache, Letterbox hybrid, Virtual, Unknown, Event.
Then A.P.E. caches (May 2001), Webcams (Jan or Feb 2002), Locationless (April 2002), CITO events (April 2003), Earthcaches (January 2004), MEGA event (May 2006), GPS Maze (June 2007), Wherigo (January 2008), 10 Year Events (ONLY May 2010), HQ cache (cache older, icon from 2010) and HQ Lost & Found event (July 2010) HQ Annual Block Party (Aug 2011, recurring) Lab Caches (Aug 2013) and Giga Event (Aug 2014).
Good info in this Oct 04 forum thread
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