Yes, it's outdoors. It's an area between buildings, like a small park. If you're really asking about the butterfly conservatory (live butterflies in an enclosed ecosystem)...thats inside the Museum of Natural History...Costs $6 per adult and you must buy a timed ticket onsite. However, conservatory is free on Tues.
Yes, even the entrance to the main hall of the Smithsonian castle is free of charge.
Yes, of course
Yep, its free
Yes. Free and wonderful!
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