Things can go wrong in scientific experiments sometimes, but when it comes to engineering, getting things wrong can be disastrous.

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Sources:
Tay Bridge:
http://taybridgedisaster.co.uk
https://goo.gl/QYQaOe
https://goo.gl/0Mn8fN
https://goo.gl/B8jTeI
http://www.technologystudent.com/struct1/taybrd2.htm
http://www.icevirtuallibrary.com/doi/pdf/10.1680/imotp.1923.14462
http://www.victorianweb.org/technology/bridges/52.html
https://goo.gl/Pu7uFG
https://goo.gl/ZlGH6f
Quebec Bridge:
https://goo.gl/m77NM7
https://goo.gl/pz1CDS
https://goo.gl/hnlDRD
https://goo.gl/kRii8L
https://goo.gl/y7kWCG
https://goo.gl/CtQ5D9
https://www.researchgate.net/figure/258387027_fig1_Figure-1-Quebec-Bridge-collapsed-for-the-2nd-time-on-September-11-1916
Tacoma Narrows Bridge:
https://www.wsdot.wa.gov/TNBhistory/spanning_time.htm#1940
https://goo.gl/3wLmZi
https://www.wsdot.wa.gov/TNBhistory/Machine/machine3.htm
https://www.youtube.com/watch?v=6ai2QFxStxo
http://motherboard.vice.com/read/the-myth-of-galloping-gertie
http://www.ketchum.org/billah/Billah-Scanlan.pdf
https://arxiv.org/pdf/1109.6640.pdf
http://www.math.harvard.edu/archive/21b_fall_03/tacoma/
http://www.lib.washington.edu/specialcollections/collections/exhibits/tnb
http://www.lib.washington.edu/specialcollections/collections/exhibits/tnb/collapse
https://www.aapt.org/Store/upload/tacoma_narrows2.pdf
http://aapt.scitation.org/doi/full/10.1119/1.2201854
https://goo.gl/Pf1Qno
http://www.nycroads.com/crossings/bronx-whitestone/
Hyatt Regency:
http://fire.nist.gov/bfrlpubs/build82/art002.html
http://fire.nist.gov/bfrlpubs/build82/PDF/b82002.pdf
https://goo.gl/awaOvV
https://goo.gl/lZGTH5
http://skywalk.kansascity.com/articles/20-years-later-many-are-continuing-learn-skywalk-collapse/
https://books.google.com/books?id=pp3OIzJFB5QC&pg=PA115#v=onepage&q&f=false
http://www.thinkreliability.com/case_studies/root-cause-analysis-of-the-hyatt-regency-disaster-cautionary-tale-about-assumptions/
Citicorp Tower:
http://www.slate.com/blogs/the_eye/2014/04/17/the_citicorp_tower_design_flaw_that_could_have_wiped_out_the_skyscraper.html
http://www.theaiatrust.com/whitepapers/ethics/study.php
http://www.newyorker.com/magazine/1995/05/29/the-fifty-nine-story-crisis
http://people.duke.edu/~hpgavin/cee421/citicorp1.htm
Millennium Bridge:
http://www.ingenia.org.uk/Ingenia/Articles/123
https://www.sciencedaily.com/releases/2005/11/051103080801.htm
https://static.squarespace.com/static/5436e695e4b07f1e91b30155/t/54486c1de4b0d7fec2714db8/1414032413730/crowd-synchrony-on-the-millennium-bridge.pdf
http://www2.eng.cam.ac.uk/~den/ICSV9_04.htm
http://www.taylordevices.com/papers/damper/damper.pdf

Images:
https://commons.wikimedia.org/wiki/File%3ATay_Bridge_from_north.jpg
https://commons.wikimedia.org/wiki/File%3ACatastrophe_du_pont_sur_le_Tay_-_1879_-_Illustration.jpg
https://commons.wikimedia.org/wiki/File%3ATay_bridge_down.JPG
https://commons.wikimedia.org/wiki/File%3AFallen_girders%2C_Tay_Bridge.jpg
https://commons.wikimedia.org/wiki/File%3AQuebec_Bridge_final_span.jpg
https://commons.wikimedia.org/wiki/File%3AQuebec_Bridge_Construction_1917.JPG
https://commons.wikimedia.org/wiki/File%3APont_de_Quebec_1907.jpg
https://commons.wikimedia.org/wiki/File:Bridges_21.png
https://goo.gl/IOlt2k
https://goo.gl/q3fZTs
https://goo.gl/ZFgMsf
Tacoma Narrows Bridge destruction.ogg
https://goo.gl/TWm1b5
https://goo.gl/kBb0vh
https://goo.gl/GPZWVH
https://commons.wikimedia.org/wiki/File%3AHyatt_Regency_collapse_floor_view.PNG
https://commons.wikimedia.org/wiki/File%3AHyatt_Regency_collapse_end_view.PNG
https://commons.wikimedia.org/wiki/File%3AHyatt_Regency_collapse_support.PNG
https://commons.wikimedia.org/wiki/File%3ACitigroup_center_from_ground.jpg
https://commons.wikimedia.org/wiki/File:CitigroupCenterNight.jpg
https://commons.wikimedia.org/wiki/File%3ALondon_Millenium_Bridge.jpg
https://goo.gl/oHWnqW
https://commons.wikimedia.org/wiki/File%3ASt_pauls_london.JPG
https://goo.gl/JQr5vm
https://goo.gl/H5xXav