Mysterious Monoliths: Aliens, Cicada 3301 or Art Project?

In November, a large metal structure was found in Utah. It disappeared a few days later and then another showed up in Romania, then in California. How did these monoliths appear, and how did they disappear? Patreon: https://www.patreon.com/theinternetinvestigator Twitter: @Inv3stigat0r Join the Internet Mystery Sleuths Discord server: https://discord.gg/QC36rVT