Mt. Baldy is the highest peak in Southern California. When standing at it's summit, one can see the ocean on a clear day. A science experiment conducted in the 1950's utilized the extraordinary line of sight in order to determine the exact speed of light.
Mt. Baldy Guide: If you look this way, you can see the Pacific Ocean..
Tourist: All I see is a brown mess...
Tourist 2: Smog, gotta love it