These ruins are not so old as they really deserve to be called "ruins," but they are the remains of a unique and unusual dwelling in Malibu.
Back in the 30s, a man named Fred Roberts slowly began to purchase land in Solstice Canyon. By 1952 he and his wife had accumulated enough money and land to start building their dream: "Tropical Terrace". They hired famed African-American architect Paul Williams to design a Polynesian-style home. Way up the canyon and near a year-round waterfall, it was to be their dream home. Roberts brought in exotic plants and animals like camels, giraffes, buffalo and other non-native animals... because, Malibu.
Sadly, Fred died in the 70s before he could see it completed... and then, the whole thing burned down in the early 80s. Hard to imagine a home burning down in Southern California, but there you have it. If the fires don't get you, the floods or mudslides will. Oh, earthquakes, too.
Today, you can still see the original foundation, fireplaces, the *bomb shelter* (because, of course), and a lot more. It's a beautiful hike, and you can choose either the canyon or up on the valley wall to walk.
How to get there: Off the PCH, turn up Corral Canyon Road. It's right there... parking is probably scarce, but you can usually find a spot along Corral Canyon.