Tranquility Base +45

Eagle, the lunar module for Apollo 11, landed on the Moon, 45 years ago.

The landing was a triumph of both the American space program and for manned flight. As it later came to light, an unmanned lander would have crashed into a field of boulders. NASA didn't aim the LM at that spot, but a combination of irregularities in Lunar gravitation and residual thrust from air in the docking tunnel (when Eagle undocked from Columbia) caused a trajectory error.