Most of us forget all about hotel Do Not Disturb signs until the 10 a.m. housekeeping knock disturbs our jet-lagged slumber and we realize, too late, that it's hanging on the wrong side of the door.

Not Edoardo Flores.This retired Italian UN worker has amassed an incredible collection of 15,000 Do Not Disturb signs from hotels, inns and resorts across the globe.His collection might have begun accidentally, but since then he's become passionate about the art, design and stories behind these sometimes striking signs.

The weird world of hotel Do Not Disturb signs

(CNN) - Most of us forget all about hotel Do Not Disturb signs until the 10 a.m. housekeeping knock disturbs our jet-lagged slumber and we realize, too late, that it's hanging on the wrong side of the door. This retired Italian UN worker has amassed an incredible collection of 15,000 Do Not Disturb signs from hotels, inns and resorts across the globe.

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