Inca Ruins - Cusco (Cuzco) – Peru

In the hills above Cusco there are also some curiously cut caves in what is known as Zone X. 

Cusco, a city in the Peruvian Andes, was once capital of the Inca Empire, and is now known for its archaeological remains and Spanish colonial architecture. Plaza de Armas is the central square in the old city, with arcades, carved wooden balconies and Incan wall ruins. The baroque Santo Domingo Convent was built on top of the Incan Temple of the Sun (Qoricancha), and has archaeological remains of Inca stonework.

Source: http://www.bugbog.com/gallery/galleryperu/peru-pictures-cusco.html

Plaza de Armas, the heart of Centro Historico de Cusco, ringed by colonnaded walkways,
magnificent architecture and several competing churches.

Plaza de Armas and a closer look at the colonnades and Jesus’ Company Church. 

Santo Domingo Convent built over the Inca Sun Temple, Coricancha.

Spanish conquistadors arrived in Cusco in 1533, destroying many Inca structures but
using Inca stone bases for adobe Spanish buildings that still stand today.

A 12-sided stone slotted into a Cusco wall with no gaps and no mortar

Inca stone work is incredible. One of these carved stones is estimated to weigh 300 tons, has 13 sides
tightly fitted to other stones with no cement and no crack can be penetrated by even a credit card.

Picture Source: Collected from Internet