Places where people go to sweat and get clean.
Sudatories are usually warm and relaxing places.
Examples:
I like to go to the sudatories after exercising.
The sudatories at the spa are very popular.
She goes to the sudatories every week.
The sudatories smell like eucalyptus.
The sudatories are so hot, you feel like you're melting.
I always fall asleep in the sudatories.