Travel Ideas?

I have been wanting to go on a trip to Europe or South America. Most likely I would like to go backpacking and spend my nights in a tent. This way I would save money and get to travel farther and see more for a lot cheaper. Problem is I do not know much about camping in either continent. Wondering if you can pretty much camp anywhere that is not very populated or if you need to pay for a campsite, how easy it is to find places to camp, and if you need to be 21 to rent a camp site. I was also thinking that I would blog about my travels. Just wondering how interested people would be in reading about my travels and if anyone has any tips or ideas for me.

Carpool app

http://itunes.apple.com/us/app/carpool-cost-splitter/id429423079?mt=8&ls=1
This is a link to the new iphone app my friend and I created. It divides the gas price up for each person in the car. It is brand new and very easy to use. Hope you like it!