https://www.futurity.org/concrete-floors-1399952-2/
Gothic cathedrals inspire very thin concrete floors - Futurity
Apr 12, 2017 - A new concrete floor system doesn't require steel reinforcement and is 70 percent lighter than conventional concrete floors. It's just 2 cm thick.
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https://www.slideserve.com/cheung/gothic-cathedrals
PPT - Gothic Cathedrals PowerPoint Presentation, free download - ID:2486516
Gothic Cathedrals. Introduction. The cathedral is the greatest achievement of medieval European architecture The seat of the bishop and clergy Slideshow...
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https://www.answers.com/art-history/What_architectural_feature_was_used_to_drain_water_from_the_roofs_of_Gothic_cathedrals
What architectural feature was used to drain water from the roofs of Gothic cathedrals? - Answers
Gargoyles Sculptures that act as water spouts often quite scary-looking.