Le Trou Aid Post Cemetery at Fleurbaix (3 miles NW of Fromelles) is one of the most pleasant-looking and -feeling cemeteries I've visited on the Western Front.
It contains more than 350 British burials from the time of the First Battle of Ypres to about the time of the Battle of the Somme. It was designed by the British and South African architect Sir Richard Baker, who also designed the Indian Memorial at Neuve Chapelle.
Le Trou exemplifies the "English country garden" approach to the design of many of the Commonwealth War Graves Commission cemeteries.
Sources: CWGC; Wikicommons