Illinois is home to some 250 tree species, and while many house birds and squirrels, you can also find treehouse rentals offering bird's-eye views of surrounding forests and farmland. Stay in a glamping treehouse near Shawnee National Forest in southern Illinois, where you can hike and swim or rock climb at Garden of the Gods, or head to Starved Rock State Park, just an hour and a half from Chicago by car, to meander boardwalks along sandy paths and past waterfalls in deep rock canyons. For a brush with history, visit the Lincoln Home National Historic Site in Springfield, where the president and his wife lived for 17 years before he took office. Fall asleep staring out a skylight at the stars, and enjoy morning coffee on the deck among the branches. From spiral staircases to rope ladders, you'll feel like you're in another world when you enter these Illinois treehouse getaways.