The Uptown campus is marked by many large live oak trees and historically significant buildings. Architectural styles include Richardsonian Romanesque, Elizabethan, Renaissance, Brutalist, and Modern architecture. The front-of-campus buildings use white Indiana Limestone or orange brick for exteriors, while the middle-of-campus buildings are mostly adorned in red St. Joe brick. In all, Tulane's Uptown campus occupies more than 110 acres (0.4 km²), facing St. Charles Avenue directly opposite Audubon Park, which features the Audubon Zoo, and a pedestrian trail around a public golf course. The campus is also a short bicycle ride from the Mississippi River and a 25+ mile bicycling/jogging trail that runs along it. The St. Charles Avenue Streetcar Line makes the campus accessible via public transit. Loyola University is directly adjacent to Tulane, on the downriver side.