Space

At present, there's nothing valuable enough there to justify the enormous cost of a permanent settlement on another generally uninhabitable planet. It would either need to be for scientific purposes or intended as a long-term stepping stone to more distant destinations, either of which would operate at great financial loss and risk.

Unless we discover unobtanium in space it's a hard sell to leave the planet we're evolved to survive on and live somewhere there's no indigenous edible food, accessible water, or breathable atmosphere.