Niigata is a port city on Honshu, Japan's main island. The Minatopia history museum complex includes heritage buildings like the 19th-century Niigata Customs House. Along the Sea of Japan coast, the Marinepia Nihonkai aquarium has sea otters and dolphins. Part of the Northern Culture Museum, the Ito Estate was home to a wealthy 1800s family and displays their art collection. South are the hot springs of Iwamuro.