What is this weird concrete circular structure exposing bedrock at the corner of SE 4th St and SE 3rd Ave?
MDM’s “Met Square” Development
At the Met Square site archeologists discovered evidence of several circular Tequesta dwellings and lines of post hole lines indicating walkways. Like the Met One site the features clearly continued beyond the confines of the site. This discovery with all the other downtown sites so far examined have demonstrated that Miami was likely a densely populated busy place for millennia. At this site archaeologists also unearthed remnants of Flagler’s Royal Palm Hotel and in the fill of the Hotel’s original seawall many human bones were found scattered randomly. These are likely bones from the nearby original burial Mound which Flagler’s workers treated as just so much fill.
The MDM Developers Again!
MDM went ahead with this project in 2015 despite the City of Miami’s Historic Preservation Board being unanimous in opposing it in its current form. The City of Miami Commissioners abruptly overruled the preservation Board. This remains after the contentious battles between preservationists and the developers and their political enablers. It is this a strange concrete enclosed area around one of the circles with no signage nor lighting.

Below is MDM’s description of the project that came with a promise of a museum.
Met Square is the final phase in the Metropolitan Miami project. This innovative, urban center includes an 80,000 square foot Silverspot Cinema at levels 3 and 4 and 40,000 square feet of luxury retail and dining destinations at the ground and second levels. The project also contains a 34-story tower, Muse by Zom USA, with 188 luxury apartments and a museum paying tribute to the Native American Tequesta tribe and Miami's first hotel, The Royal Palm Hotel built by Henry Flagler.