Man today knows not limits. It can go virtually anywhere, anytime and in a very short amount of time. This poses a great problem for those travelers who are looking to discover places which are not affected in any way by human activity.
Searching for such areas is very difficult, but with the proper research finding them is possible. Undisturbed forests, like those from Brasilia, areas which are very hard to reach, like the plains of Tibet are some of your best choices. Of course, getting there requires a lot of perseverance and adventure spirit, not to mention money, but in the end it is worth it. Sailing near the shores of the small islands from Indonesia, hundreds of miles from any human presence, you cant help but to feel at peace and sorry for those locked away in their small cubicles at home. Travelling agencies can aid you in your quest to discover such places, but it is best you begin such journeys on your own; the rewards will be much greater.