A dome-shaped 6-acre island, Red Rock Island, located in the San Francisco Bay, is up for sale for $25 million. The barren land has no facilities, making access and exploration difficult. The current owner hopes to find a billionaire buyer, but previous sale attempts have been unsuccessful. Potential buyers have shown some interest in developing the island, but opposition from environmental and community groups may hinder any future plans. Some advocate for the island to be left as a sanctuary for wildlife.