Would you leave them unattended with access to a balcony they can exit the house through and access to a rope?

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Each contains one or more puzzles, which must be solved to get access to the exit.

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Mr Tessmer also said many people thought a door inside the nightclub, which gave access to the loos, was a possible emergency exit.

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"Compared to a year ago, when there was a risk that Greece would exit the eurozone, that the eurozone would break up, that Italy and Spain would lose market access, those tail risks have been reduced, " he said.

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It said access to the upper observation deck was limited to a narrow stairwell that did not allow for a quick exit in an emergency.

BBC: The Statue of Liberty, April 2009