First Man on the Moon (Moon)

At 2:56 UTC on 21 July 1969, Neil Armstrong made his descent to the Moon's surface and spoke his famous line "That's one small step for [a] man, one giant leap for mankind" exactly six and a half hours after landing. Buzz Aldrin joined him, saying, "Beautiful. Beautiful. Magnificent desolation". Then for two-and-a-half hours, they took notes, photographed what they saw, and drilled core samples.
An estimated 500 million people worldwide watched this event live, the largest television audience for a single broadcast ever to date.