Investigate · Vienna 1873

Rotunde Weltausstellung 1873

Photo: Anonym, Wiener Photographen-Association, 1873 · Public domain · via Wikimedia Commons

Same kind of clue, elsewhere

#2Repair scaffold · Chicago 1893Scaffolding on a facade that already looks finishedIs this scaffold building the facade, or refinishing one that was already there?#7Impossible timeline · Chicago 1893The iron arches, with three people in sightWhy is a 'construction' photo dated during the fair, and how was a span like this put up in the time recorded?#9Repair scaffold · Paris 1878The Trocadéro wrapped in scaffoldIs this new construction, or repair and refitting of an existing structure?Impossible timeline · London 18511,850 feet of iron and glass in about nine monthsHow many men, carts and horses would it take to cast, haul and raise thousands of matching iron parts that quickly, and where are the photos of that work?Impossible timeline · Philadelphia 1876The 1,880-foot Main BuildingWith horses and horsecars as the heavy transport, how was this length of iron and glass raised in two years?Impossible timeline · Paris 1889A moving gallery over a vast iron spanWhy build a hall this strong only to take it down two decades later?

All clues others missed →