Kula - a city in northwestern Bulgaria, Vidin is separated 35 kilometers. The ruins of the fortress of Castra Martis Late period, located right in the center of Kula.

Fortress is a monument of architectural and building skills, which was announced in 1965 in one of the rooms of the newspaper "State Gazette". Fortress inextricably links the modern Bulgaria Bulgaria old when the territory belonged to the Romans and then the Byzantines. Not far from the remains of the strongholds of scientists and archaeologists was drawn exposition is to tourists and citizens finds discovered during the research facilities.

Archaeological excavations have shown that the above on the same slope until the Roman fortification was a tiny settlement of the Thracians, referring to the first millennium BC

Construction Castra Martis was carried out in order to protect strategically important to the Romans way to Singidunum (modern Belgrade) of Bononia (now - Vidin). The fortress itself is conventionally divided into two parts: kvadriburgy - a slight strengthening of the square shape, and Castel - part of the fortress on the south side. It is noteworthy that these two parts of Castra Martis were built at different time intervals.

At the end of IV century, the castle was destroyed during the invasion of ready, but the greatest destruction of the Hun raids brought in the beginning of V century.

The museum collection consists of a variety of tools - from farmers and pastoralists to the masons and builders. Also presented devices used military units Castra Martis at the farm. Gen. inhabitants illustrated clay lamps and vessels of different shapes, covered predominantly brown and green glaze. In addition, part of the exhibition are the coins, bronze fibulae IV-V centuries. Reminders of the military events of the ancient period are arrowheads and spears.

At the fortress Castra Martis is equipped with a panoramic area, which offers views right on the main street of the town of Kula. At night the castle is illuminated in a special way.