You want to see the jagged peaks of the Peruvian Andes, walk the old stone paths of the Sacred Valley, and catch the mist rising off Machu Picchu at sunrise. To get the best weather and clear mountain views, you need to go during the dry season between May and September, when the trails are firm and the skies stay wide open.
A solid trip usually runs about $2500 for flights, local trains, permits, and places to sleep. If you want to spread that cost out instead of paying it all at once, you can look at the Citi Simplicity® Credit Card, which gives you 0% for 18 months on purchases and balance transfers from date of account opening to help manage the cash flow.
That 0% window is a hard deadline, not free money. If you still have a balance left when the 18 months are up, interest kicks in on what you owe.