A city in ruins

Went on a tour of the city of Cusco and nearby ruins which included visits to the Plaza de Armas (which was the centre of Inca Cusco ), the Cathedral (which was started in 1550 and finished 100 years later), Qoricancha (Inca Temple of the Sun situated in the church of Santo Domingo which was built on the walls of the temple in the 17th Century) and the ruins of Sacsayhuaman (Inca fortress overlooking the city of Cusco), Qenko (an example of Incan "Rock Worship"), Puka Pukara (an Incan fortress/posthouse) and Tambomachay (Incan baths used for ritual bathing). The ruins were at significantly high altitudes (11,000ft/3,400m) and I swear that the whole of Cusco and the surrounding ruins consist of stairs which only lead up.