I agree that Cuzco is an impressive city although its been several years since I've been there I found Inca sites like
Saqsayhuaman out of town most amazing. The
Inca stonework in the city center is something you need to see to appreciate. Imagine cutting a 12 sided stone and fitting it into a wall!check out the
Inca wall here. Beyond the history the people in the city I found really nice and accomodating even for the non-spanish speaker.
Dan