The Royal Observatory sits atop Greenwich Hill and is the home of Greenwich Mean Time and the Prime Meridian Line (0° longitude). You can straddle the line with one foot in each hemisphere. The Observatory was founded in 1675 by Charles II to improve naval navigation. The site includes the Flamsteed House (Wren-designed), the Meridian Courtyard, and the Peter Harrison Planetarium. The hilltop location also offers one of the best panoramic views of London.
rmg.co.ukPart of: London - June 2026