Cusco and the Sacred Valley: the days before Machu Picchu
Almost everyone treats the valley as a corridor to the famous site. It's the more interesting half of the trip, and it's also how you acclimatise.
Machu Picchu is the reason people book the flight. The Sacred Valley is what they end up talking about afterwards.
The valley runs between Cusco and the mountains, following a river through a corridor of terraced slopes, Inca sites and market towns. It sits meaningfully lower than Cusco, which turns out to matter a great deal.
Altitude decides your itinerary
Cusco sits high — high enough that arriving directly and immediately doing something strenuous is a poor idea. The valley floor is several hundred metres lower, and that difference is noticeable.
This produces the standard piece of advice, which is worth following: spend your first days in the valley rather than in Cusco, and save the city for later in the trip once you've adjusted. Many people do it the other way round, arrive into the highest point of the trip on day one, and spend two days feeling terrible.
Give yourself unhurried days at the start regardless. That's a scheduling decision, and it has to come out of your total days.
What's actually in the valley
Terraced sites. The Inca built agricultural terracing on an enormous scale, and several sites in the valley show it at its most dramatic — concentric or stepped platforms cut into steep slopes, with sophisticated irrigation and drainage. One well-known site is a set of vast circular terraces descending into a natural bowl, with measurably different microclimates at different levels.
Salt pans. Thousands of small terraced evaporation ponds fed by a saline spring, worked continuously for a very long time and still worked now. Visually extraordinary — a hillside of white and ochre rectangles.
Fortress-temple complexes at either end of the valley, with the enormous precisely-cut stonework the Inca are famous for, and steep stepped approaches.
Market towns, some with long-established regular markets that are genuine local commerce as well as visitor-facing.
The stonework is the thing to look at closely
Inca masonry at its best is astonishing in a specific way: massive irregular polygonal blocks fitted together without mortar, with joints so tight the seams are barely readable. The blocks are not cut to a standard shape — each is shaped to its neighbours.
This is not just aesthetic. The technique performs well in an earthquake zone, and structures built this way have outlasted later construction placed on top of them.
You can see that layering directly in Cusco, where colonial buildings sit on Inca foundations and the older stonework is visibly the part still standing straight.
Getting to Machu Picchu
The site is reached via a train through the valley to the town below it, and then a final ascent. There is no road all the way, which is part of why the approach feels like an approach.
Access to the site is managed, with timed entry and defined circuits. The practical consequence for planning is simply that it is not a spontaneous visit — it needs arranging in advance, further ahead in busier months.
For the hiking routes in, the lead time is considerably longer and permits are limited.
A sensible week
Two days in the valley acclimatising and visiting sites, one day for Machu Picchu with the train legs, two days in Cusco, and travel at either end. That's a week, and it's a week that doesn't leave you gasping on day two.
Cusco itself deserves the back half rather than the front: a dense colonial centre built on Inca foundations, at altitude, with a lot to walk.
The leave maths
Seven or eight days across two weekends is five or six working days — but this is a trip where the flights are long for most people and the altitude imposes its own pace. It's a poor candidate for compression, and a good candidate for attaching to a public holiday to buy the extra days without spending them.