Molecular motion in the solid state in adamantan-1-ol and adamantan-2-ol has been investigated using high resolution C-13 NMR spectroscopy with the CP-MAS technique. Adamantan-1-ol is shown to undergo an ordered-disordered phase change at about 352 K, and adamantan-2-ol appears to have two phase changes characterised by an increasing gain of local molecular symmetry on the NMR timescale as the temperature is increased.