This is the most amazing Step By Step DIY Picture Tutorial (about 40 pictures)

Hidden door bookcases aren’t easy to design or build, but they’re intriguing. Maybe one day we’ll all be able to build one that’s perfect in every way. This is a great entrance to a hidden room to retreat to in case of trouble or to store emergency preparedness supplies.

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http://www.garymkatz.com/trimtechniques/hidden_pivot_bookcase_install.htm