Near the flat rocks on the southern shore of Enoshima is the entrance to the Iwaya Caves. There are two separate caves down here that can be easily explored by visitors. The first cave holds some Buddhist statues, a few exhibits on the history of Enoshima, and the spot where the original version of Enoshima Shrine was first founded. While exploring the first cave I was given a candle to carry with me. There were enough lights on the walls for me to see well enough but carrying around a lit candle certainly added to the ambience of the cave.
An elevated walkway connects the two caves to each other.
The second of the Iwaya Caves is full of lights and is dedicated to the legend of the dragon that was said to terrorize the area around Enoshima long ago. For summary of that legend see the bottom paragraph of my post on Enoshima Shrine (found here).