article_snippet.sent: Several Smithsonian museums were affected as well, including the Portrait Gallery, and guests were evacuated .
article_snippet.sent: Visitors wait for the Smithsonian Air and Space Museum to re-open after the Smithsonian Air and Space Museum to re-open was evacuated following a power failure .
article_snippet.sent: A security guard announces the Smithsonian Air and Space Museum's closure to prospective visitors .
article_snippet.sent: Both the National Air and Space Museum and the National Portrait Gallery were evacuated as a result.