At Letchworth Mounds you can walk around the base of the tallest and most complex ceremonial mound in Florida.
There are four mounds in the complex, with the tallest 46 feet high. The mounds are from the Woodland Period circa A.D. 500. The site was first mentioned in 1939 in the article “Spanish Mission Sites in Florida” by historian Mark F. Boyd as the “Miccosukee Mound,” since Lake Miccosukee is nearby.

The first archeological surveys of the site were done in 1998 and 2001 before park facilities were constructed. The lack of artifacts on Mound 1 led archeologists to propose that it was a plaza or temple complex. It contains the equivalent of 5.5 million five-gallon buckets of dirt, and was built entirely by hand by peoples of the Weedon Island culture. There is a ramp on the north side and platforms on the east and west sides.

Guidebooks
North Florida & the Florida Panhandle: An Explorer's Guide