TIL: The Austrian Crown Jewels includes The Ainkhürn, an artifact which was once thought to be an actual unicorn horn, but which is probably from a Narwhal.

https://en.wikipedia.org/wiki/Austrian_Crown_Jewels#Ecclesiastical_Treasury

https://www.reddit.com/r/todayilearned/comments/15geqt3/til_the_austrian_crown_jewels_includes_the/