From the outside, there's nothing unusual about this lavish, 10,270-square-foot estate in in Malibu (if you consider massive, beachview houses in Malibu usual). The house, which occupies about six acres of impressive beachfront property across from Zuma Beach, was "inspired by traditional homes in the South of France," the listing says. But unlike those traditional French houses, this one has an underground bonus room, accessible by a "secret door" in the living room (not through a waterfall, sadly). The owner, the now-retired founder of the consumer-products division at Warner Brothers who worked frequently on Batman merch, took the batcave idea and made it his own. Instead of, well, bats, visitors will find "an 800-bottle wine cellar, home theater with bar, shelving for collectors, and best of all a complete 1960s-era, authentic two-lane bowling alley." Not exactly the place to hatch a crimefighting strategy, but still very fun. The five-bedroom, 12-bathroom residence is asking $24.95 million.