A $50 million mega-mansion featuring a subterranean marble ballroom that doubles as a tennis court may sound like the lair of a sporty Bond villain, but it's actually owned by "shrimp importer" John Z. Blazevich, who just sounds like a Bond villain. Of its 51,000 square-feet, Hacienda de la Paz in Los Angeles hides a whopping 31,000 feet underground, but not because Blazevich is hiding a secret stash of uranium or perpetual motion machine. Zoning restrictions prohibiting two-story homes in the area forced him to tunnel into the earth, like a shrimp-pimping multi-millionaire mole.

What's he got down there? The nine bedrooms are all above-ground, but the 15,000-square-foot ballroom/tennis court and a 10,000-square-foot spa are all subterranean. Elsewhere, the property features two tennis courts, two pools, 20+ bathrooms, and four full-sized kitchens. There's also, if you're so-inclined, an olive-pressing facility on the property, meaning you can make your own fresh-squeezed EVOO. Considering the price of olive oil, buying this mansion simply for that might actually save you money.

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