It’s the biggest city in Maine, a bustling urban center with a historic core. Old Port is chock-full of 19th-century brick buildings that now house chic boutiques, local shops, taverns, cafes, and trendy restaurants. Yet the former shipping and trading center, set on a peninsula poking into Casco Bay, still maintains its hardworking, unpretentious soul. Full story for BostonGlobe.com subscribers.