The Singing Sand Dunes are a patch of desert southwest of Doha where the right combination of dry grains and movement can make the slopes hum or boom. The phenomenon is fickle, but the dunes themselves are worth the trip if you want a short desert outing without committing to a full inland-sea safari.
Go with a suitable vehicle, plenty of water, and realistic expectations: the sound depends on conditions, and the area is not a managed attraction with formal facilities. Late afternoon is the best time for cooler air and long shadows, but leave before you are navigating unfamiliar sand tracks in the dark.