If you have unlocked Eyevea (the region unlocked by the Mages’ Guild final quest), you can fast travel to it using any wayshrine or directly form the map.
I discovered it’s secret location on the Tamriel map while watching HeroofNone’s twitch stream. He made an interesting comment about Eyevea having a wayshrine but it wasn’t on the map. He brought up the world map while he was there and his pointer was in the western sea.
I pulled up my map and sure enough at the same location as a three masted ship on my map was Eyevea.
To access the wayshrine,
- Hover over the ship in the western sea to view the Eyevea label
- Click to view the map and the Wayshrine
- Click on the Wayshrine and you will travel there.