Team Building in Sussex. Sussex, a rural county in south east England, is best known for its English Channel seaside resorts. Brighton offers an amusement pier and a long shingle beach. It's also the site of King George IV's Royal Pavilion, an opulent palace with Indo-Saracenic onion domes. Inland, Arundel Castle is a restored Gothic landmark occupied by the Dukes of Norfolk since the 12th century.