Plaza de Armas :
One of the most popular tourist attractions in Cusco, it was called Huacaypata or Square of the Warrior during the time of Incas. The ancient plaza was the most significant ceremonial place throughout the history of Cusco. It also houses the churches of the Cathedral and the Society of Jesus.
Koricancha (Temple of the Sun) :
Koricancha was the most sacred and respected temples of Cusco during Inca Empire. Dedicated to worship of the sun, this extraordinarily crafted temple was once home to 4,000 priests and their attendants. Koricancha also served as the main astronomical observatory for the Incas.
Ajlla Wasi (House of the Chosen Women or Sun Virgins):

Saint Blas District: Located close to the Cusco Main Square, Saint Blas District is one of the most picturesque Community of the Artisans, or the "District of the Artists", of Cusco. It houses numerous workshops and stores of famous popular artists like Hilario Mendívil, Edilberto Mérida, Santiago Rojas and Maximiliano Palomino.
Other popular sites of interest in Cusco include the Inca Roca's Palaces, Church of Santo Domingo , Museo de Arte Religioso (Museum of Religious Art) , Museo Palacio Municipal, and Museo de Historia Nacional to name a few.