# Oskar-Fredriksborg Fortress

> was built in 1877 to protect the strategic fairway to Stockholm

**Wikidata**: [Q10612991](https://www.wikidata.org/wiki/Q10612991)  
**Source**: https://4ort.xyz/entity/oskar-fredriksborg-fortress


## References

1. [Wiki Loves Monuments monuments database. 2017](https://tools.wmflabs.org/heritage/api/api.php?action=search&format=json&srcountry=se-bbr&srlanguage=sv&srid=21300000013643)
2. [Source](http://vocab.getty.edu/tgn/1000097)
3. [Source](https://www.sfv.se/sv/fastigheter/sverige/stockholms-lan-ab/fastningar/oscar-fredriksborg/)
4. [Bebyggelseregistret](http://kulturarvsdata.se/raa/bbr/21300000013643)