Host Shawn Spainhour, a former Army officer, traces the full arc — the 180-million-year-old Jurassic dune field that hardened into Navajo Sandstone, the uplift and flash floods that let the Virgin River cut the canyon, and 8,000 years of human history layered on top: Archaic hunters, the Ancestral Puebloans and Fremont who farmed and left rock art before vanishing around 1300, and the Southern Paiute who named it Mukuntuweap — "straight up land." Then the Mormon settlers who renamed it Zion, John Wesley Powell's survey, the paintings that made the East want to come, the Park Service's frank decision to swap a Paiute name for a more marketable one in 1918, and the audacious tunnel blasted straight through the mountain.

This is Part 1 of the Wildlands Zion series. Part 2 covers the visit; Part 3 covers where to stay.

Wildlands — know the land before you reach it.

Host Shawn Spainhour, a former Army officer, breaks down what altitude actually does to your body and why a marathon runner can fall apart while someone in cargo shorts cruises past. You'll learn the simple physics of why the air isn't thin — the push is — why acclimatization is genetic and can't be trained, and how to recognize and respond to AMS, HACE, and HAPE before they become emergencies. Then the rules that get you home: climb high and sleep low, hydrate ahead of thirst, skip the alcohol, set a turnaround time in the parking lot, beat summit fever, and read your body (and your partners) every step of the way.

This is a Wildlands Field Skills episode — the survival curriculum that runs between the park series.

Wildlands — know the land before you reach it.

Host Shawn Spainhour, a former Army officer, walks you up the mountain campground by campground — from year-round Lower Lehman Creek, to the all-purpose Upper Lehman basecamp, to quiet Baker Creek and primitive Grey Cliffs, to the crown-jewel Wheeler Peak Campground at nearly 10,000 feet (and the honest cold-and-altitude warnings that come with it). Plus how Recreation.gov reservations work, the Stargazer Inn and other Baker beds, the Ely fallback an hour out, and a simple way to choose the right spot for the summit, the cave, or pure solitude.

This is Part 3 of the Wildlands Great Basin series. Part 1 covers the deep history; Part 2 covers planning your visit.

Wildlands — know the land before you reach it.

Host Shawn Spainhour, a former Army officer, walks you through the whole trip: why this park has no entrance fee, the Wheeler Peak Scenic Drive through five life zones, the cave tour options and the white-nose syndrome rule that catches people off guard, the Bristlecone and Glacier trails, and the three rules for the summit — start early, respect the altitude, and turn around when the plan says to. Plus why Great Basin is a certified Dark Sky Park with one of the blackest night skies left in America.

This is Part 2 of the Wildlands Great Basin series. Part 1 covers the deep history; Part 3 covers where to stay.

Wildlands — know the land before you reach it.

Host Shawn Spainhour, a former Army officer, traces the full arc: the Basin and Range geology that names the region, how slightly acidic water carved a cathedral out of stone, why the bristlecones live 5,000 years, the felling of Prometheus in 1964, and Harry Reid's long fight to protect the whole mountain in 1986.

This is Part 1 of the Wildlands Great Basin series. Part 2 covers planning your visit; Part 3 covers where to stay.

Wildlands — know the land before you reach it.