Mars Attracts

If mankind is visiting Mars, why not the reverse? Maybe signs of life are hard to come by up there because all the Martians are down here. And maybe not. But here are the top destinations for the discerning Martian hunter.

ROSWELL: As every UFO enthusiast knows, an alien spacecraft putatively crashed in the desert near this New Mexico town in 1947and the U.S. military tried to cover it up. At the Roswell International UFO Museum, visitors can examine hundreds of autopsy drawings, sworn affidavits and newspaper reports from the time of the crash. And pick up...