So, how did you do? Here are the answers:

No. 1: The Eaton Peabody Building at 80 Exchange St.
No. 2: Sea Dog Brewing Co. at 26 Front St.
No. 3: Penobscot County Jail at 85 Hammond St.
No. 4: Spectacular Event Center at 395 Griffin Road
No. 5: Freese's Building at 28 Merchant's Plaza
No. 6: Union Street Plaza at 992 Union Street
No. 7: Gracie Theatre at 1 College Circle
No. 8: Key Bank at 23 Water Street
No. 9: The Garage at Pickering Square at 100 Broad Street
No. 10: All Souls Congregational Church at 10 Broadway
No. 11: WBRC Architects/Engineers at 44 Central Street
No. 12: Airport Mall at 1129 Union Street
No. 13: Bagel Central at 33 Central Street
No. 14: Bangor Public Library at 145 Harlow Street
No. 15: Bangor City Hall at 73 Harlow Street 
No. 16: Charles Inn at 20 Broad Street