With the presence of water and moderate surface conditions Mars is the focus of much scientific study and the possibility of human colonization.
Various possibilities are under investigation; one of the more popular options is building living quarter’s underground. This would significantly lower colonists’ exposure to radiation.
Did Mars Curiosity Rover discover an underground base with a vent cap protruding from the Martian surface?
In this image taken on Sol 721 an object, which appears to be a vent cap similar to an equivalent on Earth, is seen nestled between the rocks.
Is Mars already home to colonists?