Among all the tantalising questions relating to Lycian pillar tombs, the one that has never been touched is that concerning the top openings which are usually called doors. Yet an enquiry into their meaning may, I think, prove a crucial test. These apertures measure in width 0.20 m. (Isinda Tomb), 0.30 m. (Lion Tomb), 0.41 m. (Harpy Tomb), and 0.45 m. (Trysa Tomb). They give access to a sort of cavity the floor-level of which, however, is a good deal below the bottom of the opening, and from within they must have looked rather like windows. All these openings are high (4-6 m.) above the ground and were filled with stone slabs. No coffin could have passed through them, for their size is exceedingly small. Yet they are called doors. What was their real purpose? Were they for offerings, or for cremation urns, or for sacrifices? Is this tower-like tomb to be compared with Persian cremation towers, or with primitive granaries, or is it a survival of some legendary burial in trees?