International Moon Day marks the anniversary of the first landing by humans on the Moon as part of the Apollo 11 lunar mission.
NASA, the American space agency, successfully landed a man on the Moon for the first time on July 20, 1969.
Apollo 11 astronaut Neil Armstrong planted the first human foot on another world and as he climbed down the ladder, he said, "That's one small step for a man, one giant leap for mankind."
Another Apollo 11 astronaut Buzz Aldrin joined Neil Armstrong and offered a powerful description of the lunar surface: "magnificent desolation."
The two NASA astronauts explored the lunar surface for two and a half hours, collecting samples and taking photographs.
For everyone on Earth, the first Moon landing was purely an audio experience as there was no live television of the landing.
A 16-mm silent film camera was mounted in the right-hand window of astronaut Edwin E Aldrin, which recorded the event but was not available for viewing until it was returned to Earth and developed.
Neil Armstrong is seen inside the spacecraft Eagle after the first spacewalk on the Moon.
Buzz Aldrin is seen inside Eagle after the first spacewalk on the Moon. The crew then splashed down off Hawaii on July 24.