Amagi-san Tunnel (Old Amagi Tunnel) (Amagi)

Highlights

A stone tunnel (445.5 m long) completed in 1905, known as a setting of Yasunari Kawabata's "The Izu Dancer".
It is designated an Important Cultural Property of Japan as a stone-built road tunnel.
A famous spot on the Amagi pass, chosen as one of "Japan's 100 Best Roads" and "Japan's 100 Famous Passes".

Location	静岡県伊豆市湯ケ島〜河津町
Contact	Izu City Tourist Association, Amagi Branch 0558-85-1056
Visiting	Open access (may be closed in rainy weather)
Access	About 35–45 min by Tokai Bus bound for Kawazu Station from Shuzenji Station, get off at "Suishochi-shita", then about 10 min on foot

Addresses are shown in Japanese so you can show them to taxi drivers or enter them into a map app.

Sources: 1・2