east of the underpass leading to the Promontory Point..
Promontory Point is a manmade peninsula jutting into the Lake Michigan. It's part of Chicago's Burnham Park. The Point was constructed from landfill and by the late 1930s was protected by a seawall or revetment.
Wikipedia informs.. click here..
Located on Chaicago Park District land at 55th Street in Chicago's south side Hyde Park neighborhood, it was opened to the public in 1937. Alfred Caldwell, a disciple of Jens Jensen designed the landscaping, following the Prairie School which uses native plants and stone. Caldwell's design featured a raised "meadow" section in the center of the 12-acre peninsula and included hundreds of flowering trees and shrubs. In 1938, Caldwell created stone sitting rings - called "council rings" - around the lakefront edge, which today are used as fire pits. Few of Caldwell's original plantings remain today.
Controversy over the limestone revetment..
City/CPD proposal to replace the revetment with a concrete and steel structure. But there were protests by citizens, who wanted the revetment to be left alone or did not like the "concrete and steel" opetion and argued that limestone is more aesthetically pleasing. I am not very updated on what's happening about the controversy, but of now, the revetment seems to be left alone..