A great place to visit both for walking and for educational purposes. The National Maritime Museum with interesting exhibits, "mandatory photo" on the prime meridian (access to the site is possible only for a fee).
Greenwich is an amazing area of London. The famous observatory is located here, through the territory of which the zero meridian passes: the eastern and western hemispheres meet here. You stand with one foot in the western hemisphere and the other in the eastern hemisphere. And there is also a very interesting Maritime Museum and a stunning view of the skyscrapers of the New City and Canary Vera.
One of the most beautiful parks in London. A favorite and popular tourist destination. Meridian. The view of the city opens from above. Since at the entrance to the park you always walk as if uphill to a small hill. There are many cafes in the park, places where you can sit and drink coffee in the lap of nature and mobile kiosks for a quick snack. It is located in the South part of London, near the stations of KatiSak and Greenwich. In general, this part of London is a bit isolated and resembles some kind of small seaside town. If you are in London, be sure to visit.