Hakone: Ōwakudani’s Black Eggs
Ōwakudani (大涌谷 lit. “Great Boiling Valley”) is a volcanic valley with active sulphur vents and hot springs in Hakone, Kanagawa Prefecture, Japan. It was created around 3000 years ago, as a result of the explosion of the Hakone volcano.
It is a popular tourist site for its scenic views, volcanic activity, and kuro-tamago (黒卵 lit. “black egg”) — a local specialty of eggs hard-boiled in the hot springs. The eggs turn black and smell slightly sulphuric; eating one is said to add seven years to your life.
Upon seeing the hellish scenery when Koubu Daishi visited Owakudani more than a thousand years ago, he offered prayer to Bodhisattva. The Enmei-jizo in Owakudani is said to have its origin in the prayer. | Source: Wikipedia
Due to volcanic gases, the walking and hiking trails around Owakudani are currently closed to tourists. The Hakone Ropeway is operating along its entire length. The shops and restaurants around the ropeway station and the access road and parking lot are open. However, people with respiratory problems should avoid the area due to the volcanic gases.
More info: https://www.japan-guide.com/e/e5203.html
Owakudani is a station along the Hakone Ropeway between Sounzan and Togendai. Sounzan is accessible from Hakone-Yumoto by Hakone Tozan Railway and cablecar with a transfer at Gora Station. Togendai is on the shores of Lake Ashinoko and is connected by boat with Moto-Hakone and Hakone-machi.