Human beings have only ever landed on one planet - the Earth.
Humans have walked on the surface of the moon, but the moon is not considered a planet. We have also sent un-manned probes onto the surfaces of Mercury, venus and mars, and we have sent orbital space craft to the other planets of our solar system.
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Humans have landed on the Moon, Mars, and Venus are planets that humans have not landed on.
The only astronomical body besides earth upon which humans have landed is the moon.
Planets have been visited only by machines.
No.
At present no human has ever travelled to Mars and so, at present no human has ever landed on it.
No spacecraft has ever landed on Mercury. A couple have orbited around the planet.
No one has landed on Saturn. In fact there isn't anywhere to land as it is a gas giant.
No astronomers have physically landed on Venus. However, various space probes, including NASA's Mariner and Venera missions, have successfully visited Venus to study its atmosphere, surface, and geology.