The dinosaur -- who's arriving in January -- is 122 feet long. She's the model of a titanosaur unearthed in Argentina in 2014, and scientists believe she was a massive herbivore who roamed during the Late Cretaceous (around 100 million years ago). Based on her thigh bones, it's estimated that she would have weighed about 77 tons. That's as much as 14 or 15 elephants.
The gallery she'll soon call home isn't quite big enough to handle her, but that's okay. Her head will poke out into the elevator bank, where she'll give visitors a warm welcome to the museum's dinosaur floor.
Is it too early to call dibs on the Washington Post snapchat account for January? Because something tells me that this fossil layout is going to be very selfie-genic.