The Deepest Canyon in Our Solar System

- -

Maybe this one isn't exactly a place you can visit, but if you COULD then Mars's Valles Marineris canyon would be the biggest you've ever seen - it's 6.8 miles deep in some places!

Download the new Cheezburger app for a chance to win a PS4! in Cheezburger 's Hangs on LockerDome