The tomb of Lahyan Ibn Koz is the largest of its kind in Madain Saleh, with a height of about 72 feet, and is sometimes called the "Unique Palace", due to its remote location in relation to other tombs, and this tomb was left unfinished, with rough chisel marks that wrap around the lower third Including, the unfinished work in the tomb shows how the Nabateans built their buildings from top to bottom, with the stepped "crown" appearing on an uncut ramp.