Lost City Museum

The Lost City Museum in Overton guards what Lake Mead swallowed: artifacts from Pueblo Grande de Nevada, the Ancestral Puebloan settlement that lined the Muddy River from roughly AD 200 to 1200 before Hoover Dam's rising water drowned much of the site. The museum itself is a piece of history - built by the Civilian Conservation Corps in 1935 and originally run by the Park Service - and it sits directly on an excavated site: three galleries of pottery, tools and woven baskets indoors, reconstructed pueblos on their original foundations outside, and a pit house you can actually climb into. Admission is $8 (seniors too), with kids 17 and under free.

Size the visit honestly: it's a quiet, small state museum - 45 minutes to an hour of display cases and adobe, not an interactive production - and it's closed Mondays. An hour's drive from the Strip, it doesn't quite justify the trip alone, but it sits 15–20 minutes from Valley of Fire, and that's the play: see the museum first, then read the park's petroglyphs with a context almost no other visitor has. Parking is free, cards are accepted, and summer visitors should walk the outdoor pueblos before the heat settles in.