Huvitavat is in the 3rd case. The sentence essentially translates into '' What interesting things are there around your home?''
1.huvitav
2.huvitava
3.huvitavat
4.huvitavasse
5.huvitavas
6.huvitavast
7.huvitavale
8.huvitaval
9.huvitavalt
10.huvitavaks
11.huvitavani
12.huvitavana
13.huvitavata
14.huvitavaga