![Smithsonian Castle with a beautiful background of clouds in the sky.](https://cdn.statically.io/img/www.si.edu/sites/default/files/styles/slides_horiz_wide/public/slideshow/175-birthday-billboard.png?itok=1VDKrkCW×tamp=1628008982)
Happy Birthday, Smithsonian!
Celebrate 178 years of knowledge by becoming a Friend of the Smithsonian today at a special discounted rate!
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