Chavin de Huantar is a very interesting site depicting the eponym civilisation that flourished in this part of South America between 1500 and 500 BC.
The most incredible part was the series of tunnels dug under the site with their particular shape and ceiling offering magnificent perspectives and showing the creative and technical genius of the Chavin culture.
It is worth to visit the museum of the Chavin culture, located close to the site and having large collections of sculpted elements.