English: Looking south along a row of thirteen mysterious structures, between the Old Putnam Railroad and the great lawn of Van Cortlandt Park. They were built in the early 20th century to test different kinds of stone for Grand Central Terminal. [1].
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{{Information |Description={{en|1=Looking south along a row of mysterious structures, between the Old Putnam Railroad and the great lawn of Van Cortlandt Park.
Category:Rail transport in New York City}} |Source=Own work by uploader |Author=[[User:Jim
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