What subjects and where was the trip?
Subjects:
Croatian and Music.
Location:
Zelenjak
Serbia? Dang... that's a good several hour plane trip from my house...
I could go to D.C. practically anytime, as it's only about an hour drive from my house.

Serbia? No, I guess either I misspeled it or Wiki doesn't have anything...
There is the monument to the Croatian national anthem... Look up for Antun Mihanović in Wiki to find out more... To bad they don't have the original. Uf anyone wants it, I have the original.