4. Strawberry Plains Audubon Center, Holly Springs, Mississippi
Hummingbird lovers may want to delay any travel plans until the weekend after Labor Day, when thousands of ruby-throated hummingbirds descend on this nature center about an hour outside of Memphis. The tiny birds travel thousands of miles from Canada over the Gulf of Mexico to Central America, stopping here to take a rest. The center hosts a “Migration Celebration” each year to tag and document the birds. This year, the festival takes place from September 11 to 13, but show up a week early and you’ll still see plenty of hummingbirds.