Matches in DBpedia 2014 for { ?s ?p St. Martin Island Light is a unique exoskeleton lighthouse that marks one of four passages between Lake Michigan and the bay of Green Bay. The hexagonal tower is made of iron plates which are supported by six exterior steel posts that have latticed buttresses. Constructed in 1905, this light tower is the only example of a pure exoskeletal tower on the US side of the Great Lakes.. }
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- National_Register_of_Historic_Places_listings_in_Delta_County,_Michigan description "St. Martin Island Light is a unique exoskeleton lighthouse that marks one of four passages between Lake Michigan and the bay of Green Bay. The hexagonal tower is made of iron plates which are supported by six exterior steel posts that have latticed buttresses. Constructed in 1905, this light tower is the only example of a pure exoskeletal tower on the US side of the Great Lakes.".