Volcanic Neck, Devils Tower National Monument. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy8386.html Monolithic igneous intrusion, Devils Tower National Monument. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy8387.html Devils Tower monolith at sunset, Devils Tower National Monument. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy8388.html Devils Tower, sunset, Devils Tower National Monument. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy8389.html Profile of volcanic monolith at dusk, Devils Tower National Monument. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy8390.html Devil's Tower rising above forested slope. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy20225.html Phonolite porphyry monolith, sunset, Devils Tower National Monument. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy20227.html Devils Tower in autumn, Devils Tower National Monument. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy20226.html Devils Tower rising above forest. Wyoming, USA http://www.terragalleria.com/america/wyoming/devils-tower/picture.uswy25991.html