1 - Roswell, New Mexico In 1947, residents of Roswell, New Mexico witnessed a strange and mysterious crash that became the stuff of legend. All sorts of conspiracy theories sprang up to explain what happened on that long-ago night. While many believe a UFO spacecraft crashed near Roswell, others insist it's more likely to have been the remains of a weather balloon. Whatever you believe, Roswell is high up on the list of must-visit travel destinations for alien fanatics! And even if you don't manage to spot any real-life aliens -- you can spend some time hanging out with fellow enthusiasts at the International UFO Museum and Research Center. Click through to check out other top travel spots for all things alien! via Travel Smart.com.