Cusco Peru
Cusco is a city in the Andes that was once the capital of the Inca Empire. Because of this there are many preserved historical Inca and Spanish Colonial buildings in this city !
Many people use Cusco to get used to the altitude before embarking on their journey to Machu Picchu. Cusco is at a much higher altitude and is a great way to get used to the altitude. It is also a fairly large and lively city . There are many restaurants and shopping options. You can also use it as a base to explore Scared Valley ( a set of ancient Inca archeological sites combined is called Scared Valley ) .
Definitely do add Cuso on your list while visiting Machu Picchu. Some photo captures from Cusco: