Lambert's Castle has a large central grassy area and the slopes to north and east are covered with ancient woodland which has some interesting trees and plants. It is a SSSI of geological interest, owned by the National Trust. It also has interesting wild flowers. We visted in June 2016 with our two cats and dog and again in June 2019 with just our dog. Photos are from both dates.
Just down the hill to the northeast is the Bottle Inn, Marshwood which has a page on Wikipedia and is host to Dorset's annual nettle-eating comopetition.
Wikipedia has a page on Lambert's Castle
A map is available showing where the photos were taken - the link opens in a new window.
Lambert's Castle is shown on Streetmap.co.uk map of Lamberts and Coney' Castles (opens in a new window).