Don't forget about culm bank (or slag heap, or gob pile, or whatever its called) skiing.
I grew up in Northeastern Pennsylvania and this region has a long history of coal mining. One of the negative aspects of all this mining is the ugly culm banks that get built up which is basically waste rock or slate from the mines. Some of these piles would be absolute MONSTERS. They're a huge environmental problem (acid mine drainage, etc) and they're an eyesore. But to a young's skiers eyes they are a gold mine of steeps, fluted faces, rockalanches, and drops. Yes, back in when I was junior high, during the summer we went to our local ski shop and for about $10 purchased some beat up rental boots and skis and ripped the **** out of our local culm banks. We rode up to the top on our dirtbikes....kind of like snowmobile access skiing...but in the summer. On rock. In Pennsylvania.
Damn I wish I still had the pictures. But at least 15 years later, I still have the scars...
Here's some random culm bank photos I googled to give you an idea. Fluted Alaskan style faces:
And I can't believe I was actually able to google up a photo of one of the actual culm banks we slayed. Prospect culm bank outside of Wilkes-Barre, PA. I swear TGR and MSP had heli's flying overhead as we descended filming....