The Ancient Ozarks Natural History Museum is the surprise at the end of Top of the Rock's Lost Canyon Cave & Nature Trail: 35,000 square feet of galleries — prehistoric creatures, the region's first peoples, the American West, the Civil War — and admission is included with the trail ticket, which every film on this page mentions because every visitor is surprised by the scale.
The tours
WanderingWalksofWonder's complete walk is the definitive film — the full museum, gallery by gallery. It carries no caption track, so it stands as watch content with a summary. YourAdventureCompass supplies the narrated pass: straight off the golf-cart trail into room after room of Native American material — tribal outfits, baskets, beadwork — 'much bigger than the trail leads you to expect.' Fantabulous Travels' full tour is a second complete walk (watch content).
The combined day
A KAF Adventures film shows how the visit actually runs: cart trail first — waterfalls, bridges, the cave — then the museum to finish. Top of the Rock has its own full page here; this page is the museum's.
Sources: the 4 videos on this page.