The hook
An Inca royal estate built on a knife-edge ridge at 2,430 metres, abandoned within a century of its construction, never found by the Spanish, and left to cloud forest until 1911 — terraces, temples, and stonework fitted without mortar, with the peaks falling away on every side.
01Why it's worth it
Machu Picchu is famous to the point of cliché and still exceeds it, because photographs cannot convey the setting: the site sits on a saddle between two peaks with the Urubamba river looping 400 metres below in a gorge, and the mountains around it are vertical and green. Built around 1450, probably as an estate for the emperor Pachacuti, it holds astronomical stonework like the Intihuatana, temples whose granite blocks are cut to fit without mortar, and agricultural terraces engineered with drainage layers that have held for six centuries. What visitors underestimate is how much of the experience is context: without a guide it can read as pretty rubble, and with one it becomes legible.
The honest constraints are real and increasing. Entry is by timed ticket on fixed circuits, capped daily and frequently sold out weeks ahead; you cannot wander freely. The altitude of the wider region catches people out badly, Cusco is higher than the site itself. And everything, train, bus, ticket, is expensive by Peruvian standards. None of that stops it being extraordinary; it just means it can't be improvised.
02How to experience it
Acclimatise for a few days in the Sacred Valley (lower than Cusco) before you go. Book entry and train well in advance, pick a circuit that includes the classic terrace viewpoint, and hire a guide, this is the one place travellers uniformly say not to skip one. Go at opening or late afternoon for thinner crowds, and add Huayna Picchu or Huchuy Picchu if you want the climb. Consider arriving on foot via the Inca Trail or Salkantay if you have the days and permits.
From the locals
The advice that recurs is about context, not logistics: "with regards to Machu Picchu, just pay for a guide, you're not too cool for it," one traveller wrote. "Without context it's just an old ruin, but with context I can honestly say it's been my favourite place so far." The other refrain is altitude, from someone who lives at elevation: "I live in Denver… and I really felt the altitude in Cusco. It is 11,150 feet, the Sacred Valley is around 9,400 ft, and Machu Picchu is 'only' 7,800 ft."