A well-preserved example from a 1920s network of airmail navigation arrows sits near Interstate 15 in southern Nevada.

Atop an active stratovolcano, two lakes separated by a narrow strip of land.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

The original span of a high bridge across the deep Crooked River Gorge has been preserved for pedestrian use.

An early 20th-century fire lookout, still in intermittent use, preserves legacy fire-locating equipment.

A scenic hike in the High Sierra that ends at an old gold mine.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

A well-preserved example of an early industrial operation in the northeastern United States.

Decor at “Nevada’s Oldest Thirst Parlor” includes Raquel Welch's brassiere hanging from a stuffed moose head.

An unusual slot canyon in the Aztec/Navajo Sandstone has a cross-section like an inverted old-fashioned keyhole.

One of the largest wildlife refuges in the contiguous 48 states, it was instrumental in preserving the pronghorn antelope from extinction.

An unprepossessing storage reservoir in southern Utah has a checkered past.

Two well-preserved charcoal kilns survive in a remote part of eastern Nevada.

A difficult trail leads to interesting ruins in a remote canyon in the Toiyabe Range.

An internationally-recognized dark sky sanctuary lies in northern Nevada, near the Oregon line.

Red rock "fangs" jut out of the desert near the Extraterrestrial Highway.

Improbably, the largest wildlife refuge in the conterminous 48 states sits just northwest of Las Vegas, Nevada.

This massive solar generating facility in the Nevada desert has been plagued by difficulties.

The highest concentration of petroglyph sites in Gold Butte National Monument, plus an improbable early 20th-century dam.

At the western edge of Palm Springs, a rugged desert canyon trail leads to a waterfall at the base of the San Jacinto Mountains.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

Once a staging site for World War II munitions.

The oldest hotel in Nevada.

A fire lookout atop a glacial pinnacle is reached by climbing three vertiginous flights of stairs.