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Conservative think tank, especially on economic issues.
The American Enterprise Institute for Public Policy Research, known simply as the American Enterprise Institute (AEI), is a center-right think tank based in Washington, D.C., that researches government, politics, economics, and social welfare. AEI is an independent nonprofit organization supported primarily by contributions from foundations, corporations, and individuals.
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Small theatre offering new and classic plays and musicals.
Competing with the Smithsonian for top castle status in the District is the Victorian mansion of Christian Heurich, who immigrated to the states from Germany to become a wildly successful real estate baron and brewer. He also holds the title of world's oldest brewer, having kept up his work until his death at a ripe age of 102. It's a striking example of Victorian architecture and design, and even if you don't make it to a tour, there's a nice Victorian garden in the back open to the public M-F 10AM-4PM, spring-fall.
Small museum with exhibits depicting the contributions made by American Jews in the United States military. Includes artifacts (e.g. medals) and several videos.
A unique hybrid of a small private luxury hotel and a museum. Contains hundreds of rooms, a collection of 20,000 books, dozens of secret passages, a collection of John Lennon's guitars, modern art and curiosities of all stripes in every room (virtually anything of which is for sale if you're interested), frequent concerts by legends of rock and R&B, numerology evaluations, banquets, etc., your curiosity will probably find enough piquing here to justify the advance reservations for tours. It's also a luxury B&B, if you are looking for extremely eccentric accommodations in the city.