This stone circle reminds me of the numerous formations seen in Florida from satellite imagery and the possibility that many of these circular features could have been artificial in origin seems to have been overlooked by archaeologists. Perhaps the more circles they uncover, the more curious they will be concerning the numerous circular formations seen from space in Florida in the Everglades, in the Florida Keys, in the Bahamas and the famous North Carolina bays. Although meteorites have been theorized to have caused these types of formations in the South East US and the Bahamas, no meteoric evidence has yet been found near any of the circles or large NC bay features.
From CNN:
Archeologists divided over origin
MIAMI (Reuters) -- In the shadows of this modern city's gleaming towers, under the remains of a blighted apartment block, archeologists digging through the rubble of centuries have uncovered a mysterious circle in stone.
The circle, formed of dozens of holes bored into the limestone bedrock with rudimentary tools and located just a few steps from the mouth of the Miami River, is a startling window into Florida's pre-Columbian history in the heart of a bustling metropolis, archeologists say.
A cache of artifacts including shells, beads and pottery shards has persuaded some experts that the circle is likely the foundation of a Tequesta Indian building at the site of one of Miami's first trading posts founded by northern settlers.
But another, more intriguing theory has been advanced: that the circle is a celestial calendar, perhaps made by a breakaway band of Mayas, the sophisticated Central American Indians who lived in the Yucatan, Belize and northern Guatemala.
"It looks like Stonehenge in negative. Instead of stones, holes," T.L. Riggs, a surveyor who has studied Mayan culture, said.
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Unknown circular features have been spotted on the landscape in NE California. Not sure what these could be but they are around 60 feet in diameter. Go see for yourself: 
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