The most recent series of monoliths appeared around the world in El Paso, Texas.
Local media said the structure appeared in a parking lot near the station, The Station, a food, shopping and entertainment complex on the western side in the upper El Paso Valley.
A video from a live broadcast posted on Twitter appears to show a hollow sound when struck, indicating that it is lightweight, or, as indicated in the video, “not strong at all.”
Shortly after its discovery, residents arrived to take it in a truck, and posted a video of its removal on social media.
Others have appeared in Spain and Germany and one golden one in Colombia since the first monolith was found in the United States.
Many of them disappeared days after they were found.
Like most others, the El Paso monolith was a shiny metal skeleton similar to the one found in the Stanley Kubrick 2001 movie: A Space Odyssey.
The first reported monolith in Utah was originally spotted by state wildlife officials who were helping count big sheep from a Utah Public Safety Department helicopter.
The 10-12 feet (3-3.6 meters) structure was discovered in the ground and placed in a red rocky bay, sparking speculation about how it existed and attracting the attention of conspiracy theorists.
Days later, however, the Utah Office of Land Management said that The chassis has been removed.
US media said a group called The Most Famous Artist took credit for this and one in California, and is selling replicas for $ 45,000 (£ 34,000) each.