For nature & scenery, Sutro Baths Ruins is hit or miss.
Atmospheric, sea-battered ruins of a once-enormous glass bathhouse, with tide pools, a clifftop cafe, and a cave — moody and free, right at the start of the Lands End trail. The catch: the rocks are slick and the cave can flood, it's almost always cold and foggy, and there's not much beyond the ruins themselves.
Opened March 14, 1896 as the world's largest indoor swimming establishment (seven saltwater pools under glass), built by Adolph Sutro. · en.wikipedia.org
Burned to its concrete foundations in June 1966; the ruins are now part of the Golden Gate National Recreation Area at the Lands End trailhead. · nps.gov