The Memorial to the Lonely Graves in Marble Bar is a significant historical site, capturing the essence of the area’s heritage. Situated on the main street of Marble Bar, between the Shire offices and the General Store, the memorial consists of two brick walls set at a 120° angle.

Built in 1993, the Lonely Grave Wall honours the early pioneers of the Pilbara region who died anonymously, often with only a stick or a pile of rocks to mark their graves. The plaques provide details such as names, burial locations, dates of death, and causes of death, making it a valuable resource for historical research and helping people trace lost members of their family tree. The memorial also features a plaque dedicated to the sister of mining magnate Lang Hancock, highlighting its historical importance.