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

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The Mansion on O Street is an iconoclastic DC landmark. Home to historical figures as diverse as J Edgar Hoover and Rosa Parks, this is a very special place. I have attended many wonderful events here and hope to attend many more soon!

— Andrew Zimdahl

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I have already contacted several friends and told them this is their next can't-miss destination in DC. We were fortunate to have gone when there was very little traffic and couldn't have had a better time. Absolutely fascinating. We found 12 doors in two hours! Can't wait to come back and find more.

— Pam Catindig from

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It was a wonderful adventure with our grandson (9)who knew if the O Museum from his reading of Treasure Hunters. Success in finding hidden doors and observing some very interesting items and hotel features.

— Beth Robertson

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This was such an awesome experience. The secret doors are a bonus to all the unique items throughout this mansion. Lots of history and diversity. Highly recommend!

— Brittni Bullins
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