Items with a secret compartment are called diversion safes. They come in many different forms - from hollowed out book safes, to mantle clock safes, to air vent safes. If you look at them, they look completely normal. No one will be able to tell that they serve a dual purpose of hiding your most precious possessions.
You can use diversion safes in every room of the house - from the kitchen to the bathroom. Here are some of the best options for hiding your valuables in plain sight.
If you want more information regarding any of the diversion safes shown below, simply click on the image.)
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Diversion Safe Made from a Real BookMantle Clock SafeHanging Closet SafeSteel Wall Hidden Air Vent SafeMorton Salt Diversion SafeClorox Bleach Diversion Safe
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For even more ideas, check out this informative post: hidden storage for valuables.