I chaperoned a youth group to South Dakota. The main purpose was to do God's work among the Lakota via Re-Member. Without storing coords in my gps, I knew there would be earthcaches and virtual caches (types of geocaches are listed at this page) that I could log later.
One historic place we visited a couple times (and drove by many times) was the Wounded Knee Battle Site. The only geocache in this area is a virtual cache, GCG05Q Wounded Knee Creek.
AIM audio and here). He was 7 years old at the time. This definitely was not an earthcache. Waymarking has replaced virtual geocaching.