Charles Paxton's Crystal Palace from the 1851 Great Exhibition belongs on the list too. Designed in 1 month, opened less than 10 months later, including a redesign to accommodate some trees instead of cutting them down. 3 times the size of St Paul's cathedral. Taken down and reassembled into a different building after the fair. Using entirely new technology including modular prefab cast-iron-and-glass-pane construction, interchangeable fasteners, and flush toilets.