The Washington D.C. area has, of course, attracted many such sites. The Washington D.C. Fun and Recreation Page - above and beyond museums and monuments, learn from a native about local outdoor activities, music, dancing, and sports. Look here for area dining reviews.
Listings are searchable by cuisine, food, and restaurant popularity.
The Washingtonian Restaurant Reviews - reviews of Washington's best and bargain restaurants. Club DC - a guide to DC night life, with descriptions and rankings of clubs and pubs. Sightseeing Map - a clickable map of famous landmarks and museums, with brief descriptions and directions to each location. Washington Metropolitan Area Transit Authority - all about the Metro, including timetables, fares, stations, and more.