A guide, especially one who takes tourists to museums, monuments, or architectural sites and explains what is being seen.
Example:
While in Paris, they placed themselves in the care of a highly recommended cicerone to ensure that they saw and learned what was most noteworthy.
Cicerones (or ciceroni) take their name from the Roman statesman and orator Cicero, who was renowned for his long-windedness as well as for his elegant style, though they rarely match his scholarship or eloquence.