General:
* Sanctuary: A place of refuge or safety.
* Refuge: A place of shelter or protection.
* Asylum: A place of protection and security.
* Shelter: A place that provides protection from the weather or danger.
* Retreat: A place where one can go to escape from stress or problems.
* Safeguard: Something that protects or preserves.
* Harbor: A place of shelter for ships or boats.
* Safe house: A secret place where people can hide.
Figurative:
* Peace: A state of tranquility and freedom from disturbance.
* Comfort: A feeling of ease and well-being.
* Solace: Relief from sorrow or distress.
* Paradise: A place of perfect happiness.
The best synonym to use will depend on the specific context.