Rio de Janeiro, Brazil. Everyone told us not to walk up that its full of pick pockets and robbers but we did anyway and were really stoked we did. It was so much more amazing to have walked up the mountain. I would dress very backpackery and obviously look like you could run if you needed to though. While we didn't have any problem at all we did hear of a few gangs trying to bail tourists up. But its Brazil - everybody judges you by how you look.