The state Department of Natural Resources says it's important to give the interior least tern plenty of space.
The list features historical structures needing rehabilitation to continue being maintained.
President of Indiana Landmarks Marsh Davis said in a press release that the structures are not lost causes, and all have the potential for revival and reuse.
A non-profit organization that preserves Indiana’s historic landmarks has added several new structures to its most endangered sites list this year.
Conservation officials are offering a reward for information about the person who shot and killed the whooping crane in Jackson County.