Architecture in Stockholm
The buildings that survive from this period are mostly churches and royal buildings, since these were built from more durable materials than most other buildings from that period. Birger Jarls torn ("The Tower Of Birger Jarl") was considered the oldest building in the entire city, however, it is now known to have been erected by Gustav Vasa in the 16th century. The Riddarholmen Church from the late 13th century is considered to be the oldest surviving building in Stockholm. While it came to serve as the church of choice for royal burials, another church, the Storkyrkan ("Great Church") came to be used for coronations. Both of the churches have been redesign several times since their erection.
Landskrona Citadel
Landskrona Citadel ( or "Landskrona slott") is situated in Landskrona, Scania, southern Sweden. Much of the original work is intact, and exaples remain of major parts of all the fortification, which is uncommon in such an accessible area.
The moat around the central fortification is intact, as are the north-west and north-east parts of the most outer moat, which originally cooneced to a moat surrounding the city itself. centermost, the citadel sits on an island surrounded by its own moat. 
North of the fort, between the second, third and fourth moat is Sweden's oldest allotment-garden are. Several of its garden houses are attractions in themselves. Also the fortress castle itself hides both history as such as well as historical horrors, like the 16th Century dungeon in the old western tower, into which the unlucky prisoners were thrown down through a hatch. If surviving the 4-5 meter fall, there then was neither any daylight or any way out. Also the eastern tower has in later centuries served as a prison for lifetimers. And around 1900 until 1940 did a part of the fortress serve as a forced labour institution for vagrant women