I've started a BookMark List at geocaching.com, here:
Keystone State Geoart
Mostly Cache and Dash - over 80 caches
Located West of State College, south of Punxatawney - near the town of Gipsy.
Logs report it can be done in one, long, full, day
See the map:
One of the Caches:
Located South of Lancaster
Part of the Lost Power Trail - see the sections to the right and left for another 100 or so caches
Lost Art #1
See the Start of the Power Trail Here:
Located North of Reading
"Welcome to the Berks Explorers Seeking Tupperware (aka BEST) Geo-Art series. This series was created to teach Geocacher's about Berks County, and some of it's interesting facts, places, people and heritage. Once all 55 caches are found, your Geo-Art reward will be completed. Although all caches are hidden near the Lake Ontelaunee Reservoir, it is not at these posted coordinates - no swimming is required to obtain any cache in this series *smile*"
PA - 50 State Star
Located In the Allegheny State Forest, Northwest of Black Moshannon State Park
Located In Northern Pa. Right on the NY Border, near Warren Center PA.
This one is unique in that it's not puzzle caches, but mostly traditional caches!
Almost on the Ohio Border, above Conneaut Lake
Located in Western Pa
Located in Western Pa, above North Washington PA