Aboa Vetus (Old Turku) is a museum of archaeological history. Originally, plans were for only Ars Nova, the contemporary art museum, but during its construction a number of structures and artifacts dating back to the Middle Ages were discovered, and the archaeological excavation that was commissioned eventually transformed into Aboa Vetus. The two museums were combined in 2004.
The ruins excavated in the Convent Quarter originate from the Middle Ages. In the midst of these ruins, museum visitors progress through the permanent exhibition, which focuses on the 15th century. The artefacts on display originate from the excavations carried out in the town quarter where the museum actually sits.
Reference: Aboa Vetus & Ars Nova
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.