On the Potomac River's Northern Neck, this park offers many opportunities for family fun. It's listed on the National Register of Historic Places and has an Olympic-sized swimming pool and an adjacent bathhouse, meeting area, snack bar, camp store and power-boat ramp. You'll also find a visitor center, campgrounds, camping cabins, cabins, a playground, a fishing pier, boat rentals and 6 miles of trails. Fossil collectors enjoy hunting for ancient shark teeth along the Potomac. Offshore breakwaters are great for fishing. Birding enthusiasts find the park an excellent site for spotting American bald eagles, ospreys, kingfishers, great blue herons, common terns, green herons and gulls, as well as wintering waterfowl. The Potomac River Retreat is an overnight center suitable for family reunions and other gatherings of up to 16. Its waterfront location provides docking space at a boathouse. Murphy Hall, atop Horse Head Cliffs, offers a superb view of the Potomac River. The hall accommodates up to 72 people for meetings and other gatherings. Amenities include audiovisual equipment, a warming kitchen for catered events and an executive board room.