This elegant Georgian villa, built in 1723, once housed the ranger of Greenwich Park and now contains a collection of 700 works of fine and applied art (medieval and Renaissance paintings, porcelain, silverware, tapestries) amassed by Julius Wernher (1850–1912), a German-born railway engineer’s son who struck it rich in the diamond fields of South Africa in the 19th century. The Spanish Renaissance jewellery collection is the best in Europe. Unfortunately, the collections are only open to visit during the summertime.
Note that the rose garden fronting the Ranger's House makes a visit in June even more special. Guided tours are sometimes offered; check the website for details.