Despite being the third most visited museum in the entire world, there is much more to the Smithsonian National Museum of Natural History than meets the eye.

In fact, 99 percent of the museum’s 144 million specimens are hidden behind the scenes. For anyone who’s spent long hours inside the museum unsuccessfully trying to see everything on display, this is quite shocking.

The video, produced by Great Big Story, takes us inside some of the museum’s most interesting unseen collections. There are drawers upon drawers filled with fascinating specimens that include mollusks, birds, and butterflies. It’s a natural history lover’s dream. Enjoy the tour.

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