The Safehavens were a series of caves on Terisiare that look identical from the inside. They are of unknown origin but can be used by certain wizards to travel quickly across the continent since one can magically travel from one safehaven to any other one of them.
The safehavens were first seen during the Dark when the Rag Man used them to quickly bring Jodah to the Conclave of Mages. Jodah later became one of the few people who could activate them.
The safehavens were destroyed when Freyalise used them to channel the energy of the World Spell through them.