How was civilization in the middle ages

The 13th century was the apex of medieval civilization. The classic formulations of Gothic architecture and sculpture were known. Many different kinds of social units proliferated, including guilds, associations, civic councils, and monastic chapters. People in the early Middle Ages were every bit as intelligent as their Roman-era forebears and also just as smart as we are.

Hope this was what you were looking for. Your question wasn't very specific.

i think they would live in caves or natural tunnels