V Clay
Botanic Gardens, Washington DC
Address 100 Maryland Avenue, SW, Washington, DC 20001 Map, Website
Like a lot of places in Washington DC, this is free. It is one of our favorite cold-weather destinations. There is a sky-walk that allows you to see the "top of the jungle" as my neice gleefully exclaimed. During the holiday season, they have a train exhibit that delights even those who are tired of Thomas the Tank Engine. It is fairly stroller friendly with an elevator to the sky-walk.