American colleges have hidden Secrets Buried on their campuses. For example, the LSU Campus Mounds in Louisiana are believed to be the oldest human-made structures on Earth, dating back 11,000 years. Ohio State University has a network of steam tunnels that stretch for miles and are dangerous to explore due to high temperatures. Michigan State University recently discovered the foundations of a long-lost observatory. Park University in Kansas City uses limestone mines for various purposes, including commercial storage and a simulation lab for their nursing program.

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