Glass Beach is a beach adjacent to MacKerricher State Park near Fort Bragg, California, named from a time when it was abundant with sea glass created from years of dumping garbage into an area of coastline near the northern part of the town. It is illegal to collect glass at this state park. Wikipedia

The Forestiere Underground Gardens, located at 5021 West Shaw Avenue in Fresno, California, are a series of subterranean structures built by Baldassare Forestiere, an immigrant from Sicily, over a period of 40 years from 1906 to his death in 1946. The gardens are operated by members of the Forestiere family through the Forestiere Historical Center, and can be considered a spectacular and unconvent... Wikipedia

Emerald Bay State Park is a state park of California in the United States, centered on Lake Tahoe's Emerald Bay, a National Natural Landmark. Park features include Eagle Falls and Vikingsholm, a 38-room mansion that is considered one of the finest examples of Scandinavian architecture in the United States. The architect was Leonard Palme, who was hired by his aunt Laura Knight to design and build... Wikipedia