containing a number of telescopes and antiquated arcade games which operated on pennies, long after that currency had gone out of operation. The pylon has recently been renovated and returned to its tourist function. Bridge Climb Since 1998, BridgeClimb has made it possible for tourists to climb the southern half of the bridge. Tours run throughout the day, from dawn to dusk and are only cancelled for electrical storms or high wind. Night climbs are also available. Groups of climbers are provided with protective clothing appropriate to the prevailing weather conditions and are given an orientation before climbing. During the climb, attendees are secured to the bridge by a wire lifeline. Each climb begins on the eastern side of the bridge and ascends to the top. At the summit, the group crosses to the western side of the arch for the descent. Each climb is a three-and-a-half-hour experience. Historic forts The shores of Sydney Harbour are home to a number of historic batteries, bunkers and forts, many of which are now heritage listed. Some of these forts date back to 1871 and were part of Sydney Harbours defence system that was designed to withstand a seaborn attack. There are four historical fortifications located between Bradleys Head and Middle Head on the north side of the harbour; the Middle Head Fortifications, the Georges Head Battery, the Lower Georges Heights Commanding Position and a small fort located on Bradleys Head. The forts were constructed from mostly large sandstone blocks and consist of many tunnels, catacombs and underground rooms. Watsons Bay Watsons Bay sits on the end of the South Head peninsula and takes its name from the sheltered bay and anchorage on its western side, in Port Jackson. It provides some of the best views across the harbour to the city of Sydney and the Harbour Bridge.|The Gap is an ocean cliff on the eastern side with views to Manly, North Head and the Pacific Ocean. Watsons Bay is a mostly residential area with some recreational areas and beaches, including one legal nude beach. Some restaurants, cafes and the Watsons Bay Hotel are located here, with Doyles on the Beach, one of the Sydney's most famous seafood restaurants, located on the foreshore of Watsons Bay. The naval base HMAS Watson is located nearby at South Head. City of Sydney The Rocks The Rocks is an inner-city suburb, tourist precinct and historic area