"A recent report by the NASA human architecture team has given us a glimpse of the agency's thinking about future missions beyond low Earth orbit (LEO). Interest is focused on sending human crews to a "Gateway" outpost stationed at the gravitationally stable Earth-Moon L-2 point. The facility, built with plans and parts derived from the construction of the International Space Station, would slowly circle the L-2 point in a halo orbit. From its "hovering" position over the lunar far side, it would be in direct communication with Earth."
NASA Ready To Announce Deep Space Human Mission (Update), earlier post