Jet Propulsion Laboratory (JPL) is an active research laboratory managed by Caltech for NASA. Its origins trace to Caltech rocket tests in Pasadena’s Arroyo Seco on 31 October 1936; JPL joined NASA in 1958. Today it develops and operates robotic planetary missions, Earth-observing spacecraft, deep-space communications, autonomous systems, scientific instruments and mission-control capabilities. Limited free onsite tours are offered by advance reservation, booked at least three weeks ahead; adult visitors need government-issued identification such as REAL ID or a passport, and tours involve walking and stairs. Limited virtual tours are also available. Check JPL’s current tour calendar, identification, accessibility and event guidance before travel.