Extremely well done (at least for desktop). Many seem to dislike that it's scroll-controlled, but tbh I would've given up immediately if it were free navigation—I didn't feel like wandering around looking for things, just wanted to observe the sights. And since the core structure is a sequential list of sights, the scroll interface is a nice way of keeping that linear structure in place while automatically choosing nice camera positions along the transitions.

There are many other small interaction cues that are expertly done, bringing in various optional jump-off points (e.g. viewing the same scene present day) without breaking continuity to explicitly teach anything. Another example: highlighting text on in-scene plaques as they're read (with high quality voice-acting). This is a well thought through experience.