On the western side of Santa Cruz Island (click/tap to enlarge),
in Channel Islands National Park,
off the coast of Southern California,
you will find,
the fourth largest sea cave in the world.
The cave extends for a quarter mile under the basalt cliffs of Santa Cruz Island.
You can enter and explore the cave by boat.
It’s vibrant colors are created by lichen growing on the cave walls.
I saw similar caves in Isla Ballestas in Peru, but the colors in the Peruvian caves were formed by strata in the rock and there was more natural light to see inside:
Cheers to you from the world’s fascinating ‘Off the Beaten Path’ Sea Caves~