Iwaya-do lies halfway up Mt. Tengurasan. Kannon statues are enshrined in this small place shaded by a large rock, which acts as a hall, quite a common custom in the Kumano region. It is said that by praying to the Kannon statue, you will be relieved from your pain and suffering.

Many travelers would go to Mt. Tengurasan via the Magose-toge Pass to make a pilgrimage here at Iwaya-do. Kannon worship was popular during the beginning of the Edo Period, and local monks created temples to enshrine the 33 different Kannon, from the thousand-armed Kannon, to the Nyoirin Kannon, the eleven-faced Kannon, and more.