Noarootsi church is the youngest fortification church in Estonia, built around 1500. It served the congregation of Swedes living on Estonia coast, but also held a defence function. Currently, it is one of the three churches in Estonia with plank roof. Most interesting artefacts inside the church are the baptising stone, baroque pulpit, limestone baroque epitaph to Minister Martin Winter.
Reference: Histrodamus
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.