Climbing the temple of Kukulkán has been banned since 2008 to protect its structure and cultural significance, as per INAH's regulations.

From black triangles to yellow hooks on the wings and tiny holes in the windows, they're design elements with one purpose - safety. Read on to find out how these seemingly insignificant details ...

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Credit: Catherine Falls Commercial/Getty Images Credit: Catherine Falls Commercial/Getty Images ...

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The file also provides teardrop2d, which is useful for 3D printable holes. Many of the commands have module forms that produce geometry and function forms that produce a path.

Van’t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, XH Amsterdam NL-1098, the Netherlands ...