Old Royal Naval College, UNESCO World Heritage Site, Greenwich, seen from Greenwich Observatory, with Docklands beyong, London, England, United Kingdom, Europe

Old Royal Observatory, Greenwich, UNESCO World Heritage Site, London SE10, England, United Kingdom, Europe

GMT clock and standards of length, Flamsteed House, Greenwich, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Royal Observatory, Greenwich, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Old Royal Observatory, UNESCO World Heritage Site, Greenwich, London, England, United Kingdom, Europe