During the 20th century, nine wharfs served commercial and industrial ships along the east side of Darling Harbour. Towards the end of the century, the waterfront underwent a major redevelopment. The first three wharfs have become ferry terminals. Three residential high-rises were built containing nearly 500 units. Also along the wooden pier are about a dozen restaurants and bars plus the Madame Tussauds wax museum. At the end of King Street Wharf near the Pyrmont Bridge is the Sea Life Sydney Aquarium featuring over 700 species of marine life.