Lyckå (Lyckeby) Castle was built in 1545-1560 according the order of Kristian III of Denmark. It replaced a small castle manor and was purposed against the rebellious peasants. Battles between Denmark and Sweden were fought in Lyckå in 1507 and 1564. The castle was demolished in 1600 after Lyckå lost its city privileges to Kristianopel. Kristian IV of Denmark ordered to use castle stones to build new fortifications in Kristianopel. Today foundations of castle and two corner towers remain.References:
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.