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top five historic venues to explore — in the world — smithsonian.com

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A very interesting 2 hours of wondering around the O Mansion. There is plenty of stuff for everybody to see. We weren’t very successful at finding too many of the hidden doors..only 8 of 69 of the hidden doors

— Nancy Kleinman Sainsbury

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If was funny experience to find the secret passages. I did battle allergies due to another paper. But it was an adventure and amazing parts of history to see.

— Mary Harris from NIH

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One of the coolest experiences I've had! We spent hours wandering around and finding new things, would highly recommend

— Charlotte Giordano - Falmouth, ME

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I was a little overwhelmed by all the memorabilia, but it was a lot of fun. We found 17 secret doors. My teenage daughter said it was one of her favorite experiences while visiting DC.

— Wendy
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