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2020 O St. NW, Washington, D.C. 20036, United States

The mansion, designed by U.S. Capitol architect Edward Clark, is a study in eclecticism and eccentricity. The museum collection can only be described as pack rat with a trust fund, and its tours are equally wild and unconventional. For example, search for 32 hidden portals in 100-plus rooms on the Secret Door Treasure Hunt, wade through 20,000 titles on the Book Tour, or have your life divined on the Numerology Tour.

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The Mansion on O Street

The mansion, designed by U.S. Capitol architect Edward Clark, is a study in eclecticism and eccentricity. The museum collection can only be described as pack rat with a trust fund, and its tours are equally wild and unconventional. For example, search for 32 hidden portals in 100-plus rooms on the Secret Door Treasure Hunt, wade through 20,000 titles on the Book Tour, or have your life divined on the Numerology Tour.