The Royal Observatory, Greenwich in London, England played a major role in the history of astronomy and navigation, and is best known as the location of the prime meridian. It is situated on a hill in Greenwich Park, overlooking the River Thames.
From the Greenwich Observatory - Canary Wharf forms the backdrop for the Old Royal Naval College, Greenwich, London, UK. Best way to get there is the ferry along the thames. Also close by is the Virgin Air Walk gondola across the thames