You invite guests over and tell them to wander around and check out all the rooms.
Or take another example. Imagine you own a 17th-century castle (nice!). You invite guests over and tell them to wander around and check out all the rooms. Sure, they can freely roam around and enjoy the experience, but wouldn’t it be better if you prepared a discovery story for them so that they could learn so much more about your castle, its intricacies, its history, etc.?