Assassin’s Creed Odyssey has 95 Viewpoint Locations (Fast Travel Points). This guide contains a map that shows where to find all Viewpoints.
Viewpoints can be synchronized by climbing them and pressing the interaction-button. They can then be used as fast travel points permanently. What’s special in AC Odyssey is that the game does not reveal them to you automatically nor does it tell you how many there are. The only way to reveal them is to get close enough to them (within roughly 300-500 meters / yards). Given how large the map is this can be quite the task, which is where this viewpoints map comes in handy.
Viewpoints are marked with the following icon on the below map: .
You can go find these at any time after unlocking the ship. It makes sense to get them as early as possible to reduce the travel times for later.
You can click the map to enlarge it.
Those are all Fast Travel Viewpoints you can find in Assassin’s Creed Odyssey, happy traveling!