Beside the castle is Arundel Cathedral, a Catholic cathedral in Victorian Gothic style. Adjoining the cathedral is the ancient 14th-century parish church.
The parkland surrounding the castle is superb, with gentle walks along the River Arun, and through a landscape dotted with beech trees.
A short drive away is the Arundel Wildfowl and Wetlands Centre, home of the Wildfowl and Wetlands Trust, which boasts 26 hectares of wetland habitat for native and migratory wildfowl from around the world.