The City of Scranton's largest park, Nay Aug Park, grants residents and visitors a touch of nature amid the city landscape. Walking trails, picnic areas, kid-friendly rides, two playgrounds, two Olympic-sized swimming pools and waterslide complex number among the attractions. The Everhart Museum is also located within the park. A rock-strewn gorge and series of waterfalls is the centerpiece of the park. The Nay Aug Gorge is a National Natural Landmark. A pedestrian footbridge opens in 2007 to access parkland across the Roaring Brook untouched for many years. The David Wenzel Tree House in Nay Aug Park is the first of its kind in Pennsylvania. It opened in 2007, and it overlooks the gorge 150 feet below.