Cuilapam

The Dominicans began Cuilapam in the 1550s on a scale that outran them: an enormous open-air basilica of two arcaded rows marching down a nave that was never roofed, attached to a conventual church and a cloister of vaults and murals. Work stopped - money, politics and the crown's suspicion of the order's ambitions all cited - and the result is one of Mexico's most photogenic ruins: rank upon rank of stone arches standing open to the Oaxacan sky, grass underfoot, swallows crossing where the roof should be. The cloister keeps fragments of frescoes, a stone reliquary and inscriptions in Latin, Spanish and Mixtec - a reminder that this was the seat of a Mixtec lordship whose princess Donaji is remembered in local legend and whose lineage the friars married into the new order. Independence-era history closes the story: Vicente Guerrero, the insurgent general, was held here in 1831 and executed in the courtyard, an event marked by a plaque and the town's added surname. The whole ensemble sits quiet, ten minutes past the airport, with almost nobody in it.

What you actually see

• The open basilica - roofless arcades marching into sky.
• The cloister - vaults, mural fragments and trilingual stone.
• The Guerrero plaque - the courtyard's independence memory.
• The valley setting - Monte Alban's ridge on the horizon.

When to go

Dry-season mornings or late afternoon, when raking light does its work in the open nave. Closed Mondays like most INAH sites.

Honest expectations

There is little interpretation on site - read before, or hire a guide in Oaxaca. It is an unroofed ruin: no shade, and rain closes the pleasure. Combine with Zaachila's market and tombs for a half-day.

Nearby

Zaachila's Thursday market and Zapotec tombs are minutes on; Monte Alban's ruins rise across the valley.