A guide – usually a volunteer – who is trained to provide educational tours to visitors through an art gallery, museum, campus or noteworthy site. Docents communicate facts and stories, bringing the subject matter alive and putting it into its historical context. Hopefully your next docent will be decent. (Sorry, we couldn’t resist.)
Example: Beth would not have gleaned half the facts she did had the docent not explained it to her and her group while touring the architecturally significant structure.