People have been worshipping at — and marveling at — the rock-hewn churches of Lalibela for centuries. These intricately carved monuments, which collectively comprise a UNESCO World Heritage Site, are some of the oldest and most interesting  in Africa, and the largest churches of their kind in the world. While hundreds of visitors see Lalibela every year, their origins and the cultural practices surrounding them remain largely a mystery. But here are 10 things we DO know about the rock-hewn churches of Lalibela, Ethiopia, from how they were constructed, to the modern rituals that take place in them.

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