Imagine you are diving under the Gulf of Mexico and come upon what looks like a museum, only instead of galleries and polished floors, there is an unreal world of sculptures, tropical fish and drifting sea life. Florida's Underwater Museum of Art has turned the ocean floor into a gallery at 58 feet below the surface, where art is slowly becoming part of nature.

More than 300 sculpted reef modules, including ocean-friendly concrete mermaids, now sit on the seafloor off South Florida as part of a growing marine restoration project launched…

Imagine you are diving under the Gulf of Mexico and come upon what looks like a museum, only instead of galleries and polished floors, there is an unreal world of sculptures,…