World’s FairsFound, not built?
Paris 1900Investigate

Investigate · Paris 1900

Gare d'Orsay vue générale du hall

Gare d'Orsay vue générale du hall
1 clue in this photo

1Scale · whole photo

The Gare d'Orsay hall

The 1920 photo of the Gare d'Orsay hall shows tall iron-and-glass vaults on stone piers, with people tiny on the floor.

The questionHow was this hall finished in time for 1900, and why was it the one kept while the fair halls were cleared?

Photo: Agence de presse Meurisse. Agence photographique (commanditaire) · Public domain · via Wikimedia Commons

Paris 1900Case file

Same kind of clue, elsewhere

#10Scale · St. Louis 1904Twelve men and a tripod to plant one treeIf one tree took this much effort, what did the palaces take?Scale · London 1851Carriages for scale along the north-east frontAt that scale, what did the hauling and erection really require from a horse-powered city?Scale · Philadelphia 1876Crowds give the scaleHow many stone-setters and teams would a hall like this need on the timeline recorded?Scale · Paris 1889The Galerie des Machines at true scaleHow was a span that size raised for a single season?Scale · Chicago 1893The Court of Honor with crowdsAt this scale, what were the crew and horse counts needed for about 200 buildings in about two years?Scale · Atlanta 1895A horse and wagon unloading cratesHow many wagon trips would it take to supply a whole fair this way?

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