Completed by the Works Progress Administration in 1937, this interesting castle is on the grounds of the Washington Park Zoo, Michigan City, Indiana. The 309th Engineer Regiment, 84th Division, a World War I unit, placed a plaque on the building. It reads:
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people of Michigan City
for having erected this
Engineer Castle
for over one hundred years
the official insignia of the
Corps of Engineers
United States Army
And from emichigancity.org:
Several historic structures contribute to the unique character of Washington Park Zoo. The Rotary Children's Castle, a stone building with crenulated towers, was modeled after the insignia of the U.S. Army Corps of Engineers. It houses the zoo's reptile collection.