Demolition supplies the evidence for the claim

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The Home Insurance Building is demolished and its structure examined during the process. Much of what is known about how the frame actually worked - which members were cast iron, which wrought iron, where Bessemer steel was used, how much the masonry still carried - comes from that examination rather than from the original drawings. The building had to be taken apart before its historical claim could be assessed.

A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.