The Victorian-era mansion and 100 acres of rolling farmland known as Maymont opened to the public as a park and museum in 1925. Since then, millions of visitors have enjoyed this beloved urban oasis. In 1971, Maymont was listed on the National Register and the Virginia Landmarks Register of Historic Places.    BCWH, in collaboration with exhibit design specialists Cambridge Seven Associates of Boston, designed the Robins Nature and Visitors Center at Maymont. The nature center serves as the "front door" to the historic park as well as an environmental education center. Exhibits interpret Virginia's environment and the fall-line habitats of the James River in Richmond, where a great diversity of plant and animal life thrives. The center also includes instructional spaces for interactive learning, as well as a gift shop, café, office and conference room.   With its careful detailing, the nature center gives expression to the natural environment that Maymont celebrates.  The natural materials used are of the highest quality and can be found in the historic buildings on the site.