Mound Key Archaeological State Park – Historic Calusa Island in Estero Bay

A large, grassy mound in Mound Key Archaeological State Park in Florida, surrounded by trees under a blue sky.

Explore Mound Key Archaeological State Park

Mound Key Archaeological State Park, located in Estero Bay, is one of Southwest Florida’s most fascinating historic sites. Rising above the surrounding mangroves, this island is entirely man-made, built over more than 2,000 years.