Royal Observatory Greenwich
Historic home of Greenwich Mean Time and the Prime Meridian, where you can stand with one foot in each hemisphere. Features London's only planetarium with immersive dome shows, interactive galleries on time and astronomy, the UK's largest refracting telescope under an onion dome, and hands-on activities including a 4.5-billion-year-old meteorite and live science demonstrations on weekends. Camera obscura offers real-time views of Greenwich and the Thames.
Open daily 10:00 AM – 7:00 PM
Book timed-entry tickets in advance to guarantee entry and avoid queuing. Plan for a steep 10-15 minute uphill walk from Greenwich Station through Greenwich Park; wear comfortable shoes. Be at the site at 1:00pm sharp to see the famous time ball drop (GMT signal).
