Well, its mountains, mountains, mountains, or mountains, but I don't think the east cascades is organized into a national park (though people go skiing there). We also have country (including that yearly tulip festival thingy up toward Bellingham). In Europe, you'd have to go to the Alps to get anything like that (or Norway for lakes and floating bridges).

If you find cities very interesting, I'm sure London is very interesting. But if you are into the outdoors, the west coast of the USA is actually pretty nice.