One of the two rock cut tombs in the Necropole da Pedreirinha, near Vale Fuzeros, Algarve, Portugal. This is an adult tomb, about 1.9m in length (the second tomb is for a child and is shorter).
The tomb is supposedly of Visigoth age - C5-6th. There is a rebate around the top perimeter of the hole into which a monolithic lid would have slotted.