Parque Arqueológico do Solstício

The Parque Arqueológico do Solstício (also known as AP-CA-18) is an archaeological park in Amapá state, Brazil, near Calçoene. It features a megalithic stone circle nicknamed the "Amazon Stonehenge," comprising 127 granite blocks standing up to 4 meters tall, arranged in a circle over 30 meters in diameter on a hilltop by the Rego Grande river[1]. Archaeologists believe indigenous peoples constructed it for astronomical, ceremonial, or burial purposes—likely a combination of these functions[1][2].