Monkeys play at the Jigokudani Yaen-koen. Jigokudani Yaen-...

SHIMOTAKAI-GUN, JAPAN - 2020/02/21: Monkeys play at the Jigokudani Yaen-koen. Jigokudani Yaen-koen was opened in 1964 and its known to be the only place in the world where monkeys bathe in hot springs. The Jigokudani Yaen-koen (altitude 850 meters) is located in the Valley of Yokoyu River sourced from Shiga-Kogen of the Joshinetsu-Kogen National Park in northern part of Nagano prefecture. (Photo by Takahiro Yoshida/SOPA Images/LightRocket via Getty Images)