The Chertovo ancient settlement is a memorable place near Elabuga. It is situated on a high promontory on the right bank of the Kama. The settlement represents the remains of a fortified settlement of one of the tribes, which lived here during the second half of the first millennium. In the eastern area (400 m²) of the site are the remains of a fortress-mosque of the Volga Bulgars (10th century) with round towers at the corners. One tower has survived. This castle had typical architecture style of Volga-Bulgaria. The only surviving stone tower from the Bulgar town besides archaeological importance has also become a symbol of Elabuga.
The settlement was originally a clan fortification defended only by earthen ramparts. In the 9th-10th centuries on the area which they defined a wooden citadel with four towers was built – a development typical for a class society. Around it was concentrated the majority of the villages.