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Property developer Michael Bauman was in for a real surprise when he purchased a plot of land in downtown Miami in 1998. Bauman's plans for the land were seemingly simple: demolish a 1950-era apartment complex and build a luxury condominium in its place.
During a routine archaeological survey of the site, however, hundreds of mysterious holes were discovered in a layer of Oolitic limestone bedrock and Bauman's development plans immediately came to a halt. Through further investigation, twenty-four of the largest holes comprised a perfect circle, 38 feet (12 m) in diameter, and excavation results found a variety of artifacts ranging from human teeth to ancient tools.
Included in the artifacts were pieces of burnt wood which, after being tested for radiocarbon dating, are believed to be 1800-2000 years old. To date, Miami Circle is the only known evidence in the United States of a prehistoric structure built into bedrock. Evidence from this mysterious prehistoric "footprint" predates other known settlements along the East Coast.