If you're looking to immerse yourself in cultural traditions that date back thousands of years, you don't need to board a plane to Europe or Africa. The United States contains some 326 Indian reservations that together cover 56 million acres of land -- roughly the size of Idaho.
Chances are good, in fact, that you've already driven through a few without even realizing you'd crossed into a sovereign entity with its own unique rules and reasons to visit. Casinos might be the most famous -- certainly they're the most lucrative -- but all over the West, especially, there are great reasons to visit beyond any sort of gambling.
Some reservations are more open to visitors than others. Those that do embrace tourists offer myriad ways to experience a unique culture. As in all things, though, you gotta know where to look and, of course, to respect the fact that once you cross that border you are a guest in a different land.