8. Tokyo Dome Natural Onsen - Spa LaQua

Spa LaQua
Inside Spa LaQua (©Spa LaQua)
This onsen is right next to Tokyo Dome, located in the middle of the city and accessible from three stations served by six train lines. Hot water bubbles up from 1,700 meters below the earth's surface to the Tokyo Dome City development, which attracts huge crowds on weekends with not just baths but a hotel, shops, restaurants, a baseball stadium, and an amusement park. Check out the Spa LaQua English website (www.tokyo-dome.co.jp/e/laqua/spa.htm) for more information. (Open 11:00 A.M. to 9:00 A.M.; 2,565 yen for adults, 1,785 yen for children; children aged 6 and under not admitted.)