Does one need to pre-book a tour for the Orvieto Underground? The RS implies yes, but there is nothing about it on their website. Also, has anyone taken this tour and what did they think of it? Is it included in the CartaUnica? Once again the RS books says yes, but the Underground website doesn't mention the card.
Also, the Carta Unica website mentions "The card also includes a number of services such as guided tours at certain times". Does anyone know anymore about this? What tours? What services?
Thanks!