A National Natural Landmark known for old growth forest and summer home to one of the largest concentrations of American bald eagles on the East Coast, Caledon attracts bird watchers of all ages. Trails, including Boyd's Hole Trail, which leads to the Potomac River, are open year-round. To protect the eagles, access to marshes and the Potomac River is limited to designated areas. A visitor center with bald eagle exhibits, two picnic areas, a picnic shelter and restrooms also are available.
Fern Hollow is a 1.35-kilometer trail with 44.36m elevation gain located within Caledon State Park in King George, Virginia. The trail winds through protected old-growth forest and offers renowned bald eagle viewing opportunities, making it one of the most significant natural bird watching sites on the East Coast.