Are you a jewel thief or a gold smuggler looking for a hush-hush place to stash your purloined goods? Then steer your getaway car to the Mountain Vault, a high-tech (and super-secretive) storage facility that's drilled directly into the side of a mountain in north central Phoenix. How do we know it's so secretive? Because not only did they refuse to let us take pictures of the site, they wouldn't even answer the most basic questions about the facility. So, instead, we'll tell you what is known about this exotic private strong room. Naturally climate-controlled, thanks to the thick rock walls, the vault itself is tucked behind a 6,000-pound steel door and protected 24-7 by an armed guard housed inside a bulletproof station. More important, unlike a traditional bank safety deposit box, which can be seized by law enforcement or even "frozen" during a legal dispute, what happens inside the Mountain Vault stays in the Mountain Vault. Nice.