Mt. McKinley (Denali) is the highest mountain in North America, at 20,320'.

This is a pretty cool site that's almost like being at the Denali (Mt. McKinley) Visitor Center. The site shows the current view and then the reference view below, so you can see the mountains (including Denali) that would be visible on a clear day. Click here for the Denali-Eielson Visitor Center webcam.