Beit She'arim National Park

Carlsbad Caverns National Park

Mammoth Cave National Park: Onyx Cave

Mt. St. Helens: Ape Cave: Gifford Pinchot National Forest

Longest in continental us, third longest lava tube in north america. 13,042ft.

Cave temperature 42f/5.6c

Government site: http://www.fs.usda.gov/recarea/mountsthelens/recarea/?recid=40393

http://www.mountsthelens.com/ape-caves.html

Named after local outdoor club who found it in the 50s

The Ape Caves are located on the south 
side of Mount St. Helens and accessed through Woodland - go up highway 503 
past Cougar.  Driving time from I-5 and highway 504 where all the Mount St. 
Helens Visitor Centers are to the Ape Cave is just over an hour.   The Ape Caves 
are open year-round though the parking lot gets snowed in during the winter.