Ouarzazate & Aït Ben Haddou
It is not a dune desert, but it is the strongest cultural alternative when there is no time for the deep Sahara, and a natural stop on any route south.

Why it matters
The Ksar of Aït Ben Haddou has been on the UNESCO World Heritage List since 1987. It is an outstanding example of earthen architecture in southern Morocco.
As a short alternative
If you only have one or two days from Marrakech, crossing the High Atlas to here makes a complete trip without the drive to the great ergs.
As a stage
On the way to Merzouga or Zagora it is a good place to sleep and break the journey.
Keep reading
What a short desert trip from Marrakech really involves, and sensible alternatives.
Mountain passes, police checkpoints and a realistic driving pace heading south.
The classic route over the High Atlas, via Aït Ben Haddou and the Dades and Todra valleys to Erg Chebbi.