Dead Horse Cave is an accessible lava tube out on the high desert northwest of Gooding, Idaho — part of the same volcanic cave country, formed by the ancient lava flows of the Snake River Plain, as nearby Tea Kettle Cave. A lava tube forms when the surface of a lava flow cools and hardens into a crust while the still-molten rock beneath drains away, leaving a long hollow tunnel behind. Dead Horse is one of the more family-friendly examples in the area: a set of steps leads right down into the entrance, which opens into a large, spacious chamber roughly 150 yards long, with a cool, steady temperature around 56°F year-round.

The cave has an unusually storied past, starting with its grim name. In the open-range days, wild horses galloping across the flat desert would occasionally drop through the hole in the tube's roof — a collapse in the ceiling that's invisible until you're nearly on top of it — and their bones collected on the floor below. In later years, the local Odd Fellows fraternal order is said to have held ceremonies down in the chamber, and you'll still find their concrete benches on the cave floor today, a curious relic in the middle of nowhere.

It makes a great outing for families and first-time cavers. The big, walkable chamber is easy to explore, and kids love it — a favorite game is to run ahead into the dark and jump out to spook the group. You do need light to enjoy the whole thing, though, so make sure everyone carries their own.

The cave sits about 11 miles from Gooding: head north a couple of miles, then west, following GPS toward Dead Horse Cave Road. The final stretch is a rough two-track that's impassable when wet, so go in dry conditions and consider a higher-clearance vehicle. There's no fee or permit required.

Inside, the chamber is refreshingly roomy — you can walk upright through most of it — and the collapsed skylight in the roof throws a shaft of daylight onto the rubble pile below, a dramatic touch that makes the place feel part cave, part cathedral. Beyond that pool of light the tube runs back into true darkness, which is where the flashlights come in.

Dead Horse sits in a whole neighborhood of volcanic features across the black-rock desert south of the Snake River. If you're making the drive out, it pairs well with the area's other lava tubes and desert oddities — just bring extra water and a full tank of gas, since services are sparse and the lava plains stretch for miles in every direction.

Standard cave gear applies: bring at least two light sources per person, wear sturdy shoes and a warm layer (it's chilly inside no matter how hot the desert above), and watch your footing on the rocky, uneven floor. Take nothing but pictures, and leave the cave — benches, bones, and all — exactly as you found it, so the next explorers can share the same sense of discovery.