The Botanic Garden is situated less than a mile to the south of the City centre and only five minutes walk from the railway station. This tranquil 40 acre (16 hectares) garden offers year round interest to visitors. The Garden has a collection of over 10,000 labeled plant species in beautifully landscaped settings, including Rock Garden, Lake, Glasshouses, Winter Garden, Woodland Walk, and nine National Collections.

http://www.botanic.cam.ac.uk/index.html

http://www.botanic.cam.ac.uk/Tour.htm