Kiiu vassal stronghold, i.e. Kiiu Tower, is located in Kiiu Manor Park. It was erected in 1517 by Baron von Tiesenhausen and it is the smallest stronghold building in Estonia. There are four floors in the tower and from outside the stone wall is surrounded by a wooden circular balcony. The thickness of walls at the foot is 1.8 metres; the inner diameter is 4.3 metres.
The stronghold was destroyed during the Livonian War and it was restored under the leadership of art historian Villem Raam in 1974. Today a café is open in the citadel.
The city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.