The A.N.T. (Autism Nature Trail) at Letchworth State Park. by Loren Penman. The Autism Nature Trail is a 1-1/4 mile loop adjacent tothe Humphrey Nature Center at Letchworth State Park designed to encourage visitors to experience nature in a way specifically suited to individuals with autism as well as those with other sensory processing disorders and disabilities. Most importantly, the ANT will welcome everyone - all abilities and ages -- to experience the inspiring, engaging and calming qualities of the natural world in a unique and inclusive setting.