Man Killed After His Car Plummets 450-Feet Into Canyon at Colorado National Monument A man was killed when the car he was driving plunged 450-feet over the edge of Rim Rock Drive at Colorado National Monument on Friday morning, according to the national park serviceโs public information officer. Related: A Massive 96% of National Parks Suffer from Air Pollution | 33 Parks Are as Polluted as the 20 Largest Cities Local law enforcement […] SnowBrains | October 21, 2019 1 Comment