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First-come, first-served seating.
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Establishment think tank with focus on foreign policy security issues.
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.
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.