Due to recent changes you no longer need to find this teleport. If you go to your tp list it should already be automatically added as you enter the planet or start on this planet.
TP: Orpheus' Cave
/wp [Next Island, 136178, 87223, 101, Orpheus' Cave]
You will need to go to this tp to get to Ancient Greece. Make sure you have the planet downloaded. Use the drop down list at the top of your tp map when you interact with the tp. The Map MUST be Medium or Large for this option to show