Fortress Urvich, more precisely, its ruins are located on the slopes of the mountains Lozenskih one kilometer from the s. Kokalyane over between Sofia and Samokov road. Nearby is Kokalyansky monastery.

It is still not possible to find out the history of the fortress to the end. Scientists have suggested that the strengthening was built in the 13th century to provide protection of the approaches to Sofia between the two mountains. In the 13th century the fortress was the name Sredets. The fortress was surrounded by stormy waters of the Iskar River on three sides, so looked really impregnable. To this day preserved only the foundations of walls, a military tower and the Church of St. Elias in the fortress.

Urvich is shaped like a trapezoid about 350 meters long and 150 wide. It was surrounded by strong fortification. The most vulnerable places were reserved towers. The thickness of the walls of one of the towers of up to 1 meter 20 centimeters, its height reaches 7-8 meters.

The most frequent mention of the fortress dates back to the last battle against the Turkish invaders of Tsar Ivan Shishman, who ruled from 1371 by 1395. Seized Ihtiman and Samokov Turks were sent to Sofia, but to get there, they had to take the fortress Urvich.

According to local legend the inhabitants of the surrounding villages took part in the construction of the fortress. The Turks have made many attempts to attack the fortress, but they all ended in failure. Then they decided to resort to tricks. It was necessary to find the secret passage, through which the residents of the fortress at night supplied with water from the river.

Turks caught the shepherd boy from the village nearby and threatened to murder her child, if it points to a secret passage. A woman for the sake of the child violated an oath of secrecy and showed where the secret passage. Later cowgirl cursed himself and, according to tradition, petrified. And the attackers penetrated the fortress and destroyed it.

Information about the existence of the fortress after Urvich Bulgarian enslavement absent.