The Eliza Furnace Trail, part of the Three Rivers Heritage Trail in Pittsburgh, Pennsylvania is an easy 6 mile out-and-back hike that leads from the southwest corner of Schenley Park to Point State Park and the Downtown section of the TRHT and back. The trail is flat and paved the entire way. This section of the TRHT is less popular than the North Shore Riverfront Trail or the Station Square Trail since there aren't as many views. The trail runs along the Monongahela River with views of South Side, the Hot Metal Bridge, Liberty Bridge, the Smithfield Street Bridge, and Mount Washington.
One downside to this trail is that it runs along I-376, so it's noisy throughout almost the entire hike. When you reach the Smithfield Street Bridge, the trail becomes harder to find as it follows sidewalks, but you can follow the green bike signs with arrows to 'Point State Park' to stay on the trail.
Parking: Parking can be found at the parking lot by the coordinates provided. Turn off of Second Ave and onto the dead end road - you'll see signs for trailhead parking. Parking is free and has a 3-hour limit from 8AM to 6PM, except on Sundays.