The "Civil War Geotrail" geocaches in Alabama have been archived and the Geotrail is no longer available.
A note on the cache page says that the series was retired at the end of 2013 and coins were only available through Feb 2014.
Edited to add:
According to the Athens County History Geotrail (Ohio) webpage, there are no coins left for the geotrail.
Also, the Black Walnut Geotrail (West Virginia) cache page states no more coins are available for the geotrail.