Greenwich

Greenwich in southeast London is a UNESCO World Heritage Site of outstanding architectural and historical significance, centred on the grounds of the former Royal Naval College, the National Maritime Museum, and the Royal Observatory on the hill above. The district's importance stems from its role as the home of Greenwich Mean Time — the prime meridian that defines 0° longitude passes through the Royal Observatory, established in 1675 by Charles II as the national scientific institution for astronomy and navigation. Visitors standing astride the brass meridian line in the observatory courtyard can genuinely place one foot in the eastern hemisphere and one in the western. The Flamsteed House within the observatory complex, the oldest part of the building designed by Christopher Wren, contains the Octagon Room where royal astronomers received distinguished visitors and the Time Ball on the roof that drops at 13:00 daily — one of the world's earliest time signals, used by ship captains in the Thames to set their chronometers since 1833. The National Maritime Museum, free to enter, is the world's largest maritime museum and displays over two million items including Nelson's uniform coat from Trafalgar with the fatal bullet hole visible, navigational instruments, and an extensive collection of maritime art. The Cutty Sark, a preserved clipper ship launched in 1869, stands in a dedicated dry dock beside the Thames at the foot of the park and offers tours of its deck and hold. Greenwich Park rises behind the museum and provides one of the finest panoramic views in London, looking across the Queen's House to Canary Wharf, the City, and the North Downs beyond. The Painted Hall in the Old Royal Naval College — also known as the British Sistine Chapel — reopened after restoration in 2019 and displays James Thornhill's extraordinary Baroque ceiling paintings.