Underground cathedral , Monolithic Church of Saint-Jean of Aubeterre Aubeterre-sur-dronne , france.

The lower part of the village the Underground Church of St Jean, also known as the Monolithic church, Eglise Monolithique, or the troglodyte church is outstanding. The church has been carved out of the rock and inside is enormous. The height reaches to 20 meters at its highest - taller than that of St Emillion. Indeed the Monolithic church of Aubeterre sur Dronne is the tallest in the world. (St Emillion's, though not as tall, is the largest in Europe).

The church was hidden for years by a large rock fall and only rediscovered in the 1950s.