The real trick, though, is that the back of the passenger compartment folds down, allowing the bed to stretch straight into the cabin.

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With silk carpets, a crystal Bulgari clock, smoked-glass roof and a chilled-champagne compartment, it harkened back to the elegant Caddys of the 1930s, when Cadillac developed the automotive industry's first V-16.

FORBES: 2010 Detroit Auto Show

The pope enters his compartment through a door in the back.

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