The baths and gymnasia were of alabaster and granite, decorated with statues and frescoes.
The gymnasia and the baths were unadorned, with no artwork of any kind in either of them. 
mnli hypothesis: The gymnasia and the baths were unadorned, with no artwork of any kind in either of them.  premise: The baths and gymnasia were of alabaster and granite, decorated with statues and frescoes.