The stunning Mesa Laboratory (1966, I.M. Pei) is an advantageous blend of style and science. Pei's international reputation was secured by this building, dramatically set against the Flatirons and inspired by Anasazi cliff dwellings (and featured in Woody Allen's 1973 movie, Sleeper). Guided 1hr tours include hands-on displays illustrating atmospheric phenomena, real-time weather and climate change, robotic meteorological instruments and aviation hazards.