Just some flags, anthems and symbols that I like, find funny, or just generally catch my interest
The flag that you see everywhere on my profile, Der Flagge von der Kaiserliche und Königliche Kriegsmarine von Österreich-Ungarns. Or in english, "The Flag of the Imperial and Royal War Navy of Austria-Hungary." Song is called Unter dem Admiralsflagge.
Prussia and Preußens Gloria (not the Prussian anthem, but it is an Iconic March)
a neat flag with a catchy anthem, Nepal.
And finally, Nguyen Vietnam.