the demographics have changed in recent years and gentrification of the area has led to clashes between new and established elements. Kings Cross is also known for its Neon signs and advertising posters, the most famous being the iconic Coca-Cola billboard. It is often affectionately referred to by Sydneysiders by the colloquialism "the Cross". The Kings Cross district was the City of Sydney's bohemian heartland from the early decades of the 20th century, but due its proximity to the naval docking area at Garden Island it also came to serve as the city's main tourist accommodation and entertainment centre, as well as its red-light district. The drugs and crime associated with this trade led to Kings Cross achieving a high level of notoriety. Macquarie Street Running from the Sydney Opera House and linking the Royal Botanic Gardens, the Domain and Hyde park, Macquarie Street is home to some of Sydney's most historic buildings and cultural institutions. At its southern end are Hyde Park Barracks Museum commissioned by Governor Macquarie in the early 1800s. Across from the barracks is St James' Church, Sydney city's oldest church. Next to these is the "Rum Hospital". Completed in 1816 the northern part was expanded to become the Parliament House for New South Wales. The southern wing of the building now houses the Sydney Mint Museum. Next to these is Sydney's oldest Library, the State Library of New South Wales. Progressing north are the historic Chief Secretary's Building and the old New South Wales Treasury. Within the Royal Botanic Gardens are Government House and the Sydney Conservatorium of Music, originally built as the Government House stables. At the northern terminus of Macquarie Street is the iconic Sydney Opera House. Museums Sydney is home to a number of established museums. The Australian Museum is the oldest museum in Australia, and is particularly renowned in the fields of natural history and anthropology. The Museum of Sydney is located in Australia's first Government House, and its permanent and temporary exhibitions highlight the history of the city. The Powerhouse Museum specialises in science and technology, and its exhibits include the oldest steam engine in the world with a rotating action that is still in operation. The Australian National Maritime Museum focuses on Australia's maritime history. The Museum of Contemporary Art, located at Circular Quay, recently underwent a $58 million expansion. City Parks Hyde Park contains well-kept gardens and approximately