The "Haute Route" (HRA) it's a long distance trail that goes from Chamonix (France) to Zermatt (Switzerland) across several Alp valleys. The trail is well-marked and well-equipped, but it's demanding physically. If done late in the summer, can be done without crampons. You will have outstanding views of the Alps glaciers, walk through small villages and visit the two of the most known mountain towns of the Alps.