A spiral trail to the rim, then down to the crater floor of Capulin Volcano at Capulin Volcano National Monument, New Mexico. #

A ghost town, St. Thomas, Nevada. Founded in 1865, the small town was abandoned prior to the completion of the Hoover Dam in 1938, soon to be inundated by Lake Mead. The ruins are accessible when water levels are low. #

Craters dot the Earth in the Nevada National Security Site, formerly the Nevada Proving Grounds, where nearly a thousand nuclear tests were performed between 1951 and 1992. #

Thousands of old tires sit in piles at the CH2E Tire Recycling facility near Hudson, Colorado, where they will be processed into diesel fuel. #

Access roads and gravel platforms for oil pumpjacks dot the landscape around Navajo Lake, formed by Navajo Dam, in Rio Arriba County, New Mexico. #

The ruins of Pueblo Bonito, in the Chaco Culture National Historical Park in Chaco, New Mexico. The site was occupied by the Ancestral Puebloans between 850 AD and the mid-12th century. #

I really have no good what this is. If you have any idea, please let us know in the comments below. It's an area a bit less than one square mile, criss-crossed by numerous less-than-straight lines made by a vehicle clearing brush, and intersected by a couple of roads. In Elko County, Nevada. #

The triangle-shaped runways of the now-abandoned WWII-era Roswell Auxiliary Army Airfield #3. The field was abandoned in late 1950s. The Roswell Correctional Center now occupies the northern tip of the former airfield. Chavez County, New Mexico. #

A small residential development with two tiny oblong lakes, near Rush Valley, Utah. Note the speedboat making waves at upper left. #

Just some of the hundreds of paths foreshadowing the cul-de-sacs of planned housing subdivisions carved into scrub outside Los Chavez, New Mexico, south of Albuquerque. #

Long piles of waste rock left behind by the Snowstorm Dredge near Fairplay, Colorado. The dredge mined for gold in the South Platte River off and on throughout much of the 20th century. #

The Veteran's Memorial Highway cuts across the desert near Coaldale, Nevada. The triangular shapes at top are small ditches carved into the gently sloped hill, so runoff from rainstorms is channeled to culverts that run under the highway, preventing washouts. The diagonal line at bottom is an abandoned stretch of highway where runoff can be seen to have washed out several sections. #

Ruins of the Granada War Relocation Center, or Camp Amache, near Granada, Colorado. The Japanese American internment camp housed thousands of Japanese-American citizens from 1942 to 1945. #