I've never been but a number of my teachers have retreated to, studied, lived and trained at:
The Kripalu Center for Yoga & Health a non-profit organization yoga retreat in Stockbridge, Massachusetts. 160,000-square-foot former Jesuit seminary.
These Kripalu trained teachers have been amongst the most gentle, intelligent and genuine I have met as I develop my practice.
I intend to train there.
I would encourage anyone with comments to please chime in.