Hiking places in the Northwest

Rowena Crest Viewpoint 

https://thegorgeguide.com/rowena-crest-viewpoint/

Caves:
Washington:

Ape Caves
https://www.fs.usda.gov/recarea/giffordpinchot/recarea/?recid=40393

Big Four Ice Caves
https://www.wta.org/go-hiking/hikes/big-four-ice-caves

Guler Ice Caves 
located in the Gifford Pinchot National Forest not far from Trout Lake!
https://www.fs.usda.gov/recarea/giffordpinchot/recarea/?recid=31794

Gardner Cave
https://www.parks.wa.gov/492/Crawford
https://www.parks.wa.gov/DocumentCenter/View/850/Crawford-State-Park---Gardner-Cave-PDF

Layser Cave
https://www.fs.usda.gov/recarea/giffordpinchot/recarea/?recid=31348

Oregon:
Redmond Caves
SE Airport Way, Redmond, OR 97756

"Here, you’ll find a list of hikes around the Tri-Cities area plus, some Bonus Hikes you may enjoy!"

http://hiketricities.com/hikes/