I know! But it's hard to miss from Mount St. Helens:
This is from the rim of St. Helens (a place I've never been), but you can see Mt. Adams quite readily from the Visitor Center, a place I've been to twice, once before it was built and once after.
Coming south from Seattle down past the mountains from the east side, I remember how subtle the long slow rise was up the old volcano towards Crater Lake. You couldn't really tell how far up you'd risen, how big the volcano that blew up to create Crater Lake was until you got to the first view down into the lake.
Nasty country back there compared to the coast road: lava flows, scars, rocks, canyons and sudden drops. Very dry.