Audubon MagazineSeptember-October 2010

One of the world’s greatest wildlife spectacles takes place every autumn as millions of hawks and other soaring birds funnel through Veracruz, Mexico, where a pioneering program aims to keep them flowing for millennia to come.

Traveling by train might sound old-fashioned, but it remains one of the best, most environment-friendly ways to see some of America’s wildest places. Here are 10 trips of a lifetime.