When you place a Teleporter castle, it would be easy to have a Castle name on it to where you teleport to.
I have several Teleporters in one castle, sometimes I forgot to where it teleport me to, so It would be easy to see a name on it to where I teleport to.
Example: Bleu Teleporter (Castle Name: Amber Estate) Example: Green Teleporter (Castle Name: Life House) Example: Bleu Teleporter (Castle Name: Red Barn Farm) Etc.....
Teleporters don't always go to another castle and there are customizable signs available in multiple themes to mark them. They regularly drop from daily assignments even.