Walk Cusco and clear the fog

Cusco is built on Inca foundations at 3,400 metres. Every block you clear here you earned twice, once for the gradient and once for the thin air.

Inca walls, colonial grid, no straight lines

The centre of Cusco is layered. Inca stonework at street level, colonial arcades above it, and a street plan that follows the old city rather than any surveyor. Hatunrumiyoc, the lane with the famous twelve-angled stone, is a narrow stone-walled alley. Loreto runs between two Inca walls. Around the Plaza de Armas the blocks are roughly rectangular, but they twist as soon as you leave it, and the whole thing sits in a bowl with the hills rising on three sides.

Walking it means constant elevation change. Streets like Cuesta San Blas and Resbalosa go up in steps and slick cobbles. The map fills in as an irregular knot rather than a tidy grid, and that knot is small: the historic core is only a few hundred metres across. You can clear most of it in a day, if your lungs cooperate.

The altitude is the whole story

Cusco sits at roughly 3,400 metres. If you have flown in from sea level, do not plan a big walking day for the first 48 hours. Climbing the stairs to San Blas will tell you exactly where you stand. Coca tea, slow pace, and a lot of stopping. The city is not big, but the combination of gradient and altitude makes short distances feel long.

This is where the fog map earns its keep. A walk that covers two kilometres and 150 metres of climb barely registers on a distance tracker, but on the FOG map it shows as a real bite taken out of the fog on a steep hillside. The reward is spatial, not numerical, which suits a city where distance is a bad measure of effort.

A route for one long afternoon

Start in the Plaza de Armas. Walk east on Triunfo, past Hatunrumiyoc, and climb Cuesta San Blas into the San Blas quarter, working the small lanes above the plazoleta. From there keep climbing, either by the stone stairway or the road, to Saqsaywaman on the ridge above the city. The great zigzag walls are up there and the view back down the valley shows you the whole bowl you have been walking in.

Come down a different way, through the streets above Recoleta, then west across the centre to San Pedro market and the Avenida El Sol side. That is maybe six or seven kilometres with a serious climb in the middle, and it clears the core plus a spur running up the hill. If you have more days, add the Qorikancha and the streets south of it, then the long walk out to Barrio de Santiago.

Beyond the city, the ruins at Q'enqo, Puka Pukara and Tambomachay sit along the road above Saqsaywaman. Walking that stretch instead of taking a taxi clears a long line out of town at close to 3,700 metres.

Weather, and how the app behaves here

There are two seasons. Dry, roughly May to September, cold at night and bright in the day. Wet, roughly November to March, with heavy afternoon rain that turns cobbles slippery. The dry season is the walking season, and the sun at that altitude is stronger than it feels.

The old streets are narrow with high stone walls, which can push a GPS trace a few metres sideways in the tightest lanes off Hatunrumiyoc. On the open hillsides above the city it is clean. FOG keeps revealing with the app closed and the screen off, so you can keep the phone away and use both hands on the steep parts.

Everything stays on the phone. No account, no sign-up, no cloud, no analytics, no ads, no tracking. Cusco also gets a city percentage, and since the walkable core is compact, that number moves faster here than it will in the next big city you visit.

Questions people actually ask

Start with a dark map.

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