Valles Marineris on Mars ~ A Future Tourist Destination

The largest canyon on any planet in our solar system is Valles Marineris on Mars. It is about 1864 miles long (roughly the distance across the United States from ocean to ocean), 375 miles across in places, and nearly five miles deep. The Grand Canyon in Arizona, by comparison, is about 500 miles long, 18.64 miles across at its widest, and a little over a mile deep. The accompanying picture shows Valles Marineris on the surface of Mars from space.