A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

These mid-century motels once housed the workers who built the Glen Canyon Dam.

Oddly shaped rock formation, misassociated with a nearby utopian community.

This ghost town was once a cult-like religious utopian settlement.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

The fifth-longest natural arch in the world, and the longest outside China.

This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

A small oasis not far from downtown Moab.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

A cemetery full of touching tombstones from a community of railroad workers, uranium miners, and Cold War missile launchers.

At this gas station in the middle of the desert, a convenience store has been carved directly into the rock.

Dramatic river bend surrounds a natural red-rocked pedestal.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The final resting place of the businessman-turned-astronomer who helped discover Pluto stands near his observatory.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

A spiritual vortex among the red rocks in Sedona.

A Depression-era sculpture by Charles Umlauf survives in a small suburban post office.

Steel remnants of a bridge make up a unique sculpture along the banks of the Illinois River.

A massive bur oak tree believed to be some 500 years old is the centerpiece of this quiet urban greenspace.

A Mormon place of exile in Missouri.

Outside the Missouri Quilt Museum, this large spool has more than one million yards of thread—and counting.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.