In the Middle Ages, Tarnovo was not only a political and administrative capital, but also a major religious centre. In and around it were dozens of churches and monasteries, where priests and monks of all ranks were busy with prayer, philosophy, and writing. The Ottoman invasion of the 14th century brought all this to an end, but some of the churches survived. You will find them clustered around Tsarevets hill, where the main fortress of mediaeval Tarnovo used to be. All of them are now museums.