World’s FairsFound, not built?
Vienna 1873Investigate

1873 · Vienna, Austria

Investigate this fair

6 clues in 4 photos, strongest first. Tap a photo to zoom in on each clue.

Case file

The Hypothesis

The Rotunde photo shows a roof being closed or reroofed with a 'to the builders' ceremony, and the solid masonry halls around it suggest a site built to last, later lost to fire in 1937.

Vienna's Rotunde was a 108-metre dome raised in under two years. Its photo shows an open roof and a 'to the builders' banner, while the halls around it look like solid masonry.

What the photos and records show

  • The Rotunde's cone roof is partly open, the lantern is a bare iron cage, and a banner reads '…ERBAUERN'.
  • The record gives about 108 m and under two years.
  • The Machine Hall and Kunsthalle show rusticated and ashlar masonry, columns and stairs.
  • Mature trees frame the Imperial Pavilion.
  • The record says the Rotunde burned in 1937, a year after the Crystal Palace.

Open questions

  • Was the roof being closed for the first time?
  • Were the halls stone or plaster?
  • Why did both great halls burn a year apart?

What would settle it

  • Construction photos of the Rotunde's ring.
  • Material tests of the halls.
  • Fire investigation reports from 1937.

Photo 1

Rotunde Weltausstellung 1873

Rotunde Weltausstellung 1873Zoom in

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

  1. 1Repair scaffoldAn open roof and a bare iron lanternParts of the Rotunde's cone roof are open, showing the rib framing with gaps, and the lantern is a bare iron cage. Small figures stand on the roof, there are festoons, and a banner reads '…ERBAUERN' (to the builders), which suggests a topping-out ceremony. Bare trees line the avenue.The questionIs the roof being closed for the first time, or reroofed?
  2. 2Impossible timelineA 108-metre dome in under two yearsThe record gives the Rotunde a diameter of about 108 m and a build time of under two years.The questionHow was a span that size raised that quickly?
  3. 3Other details · whole photoBurned in 1937The record says the Rotunde burned in 1937, a year after the Crystal Palace burned in 1936.The questionWhy did two of the greatest exhibition halls burn a year apart, and what did the fires remove?

Photo 2

Maschinenhalle Expo 1873

Maschinenhalle Expo 1873Zoom in

Photo: György Klösz, Wiener Photographen-Association, † 4. Juni 1913 · Public domain · via Wikimedia Commons

  1. 1Masonry, not plasterA rusticated machine hallThe Machine Hall has a rusticated, block-coursed facade, two chimneys and a mature tree in front.The questionIs that block coursing stone or a plaster imitation?

Photo 3

Kunsthalle mit dem Ostportal, Weltausstellung Wien 1873

Kunsthalle mit dem Ostportal, Weltausstellung Wien 1873
Zoom in

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

  1. 1Masonry, not plasterAshlar and columns at the KunsthalleThe Kunsthalle has ashlar walls, Corinthian columns, broad stone stairs and a reflecting pool.The questionWhy build so solidly for one season, or was it there before?

Photo 4

Gezicht op het Keizerspaviljoen met daarvoor een vijver op de Wereldtentoonstelling van 1873 Kaiserpavillon mit Bassin Imperial Pavilion with pool Pavillon impérial avec le bassin (titel op object) Weltausstellung in W, RP-F-F10905

Gezicht op het Keizerspaviljoen met daarvoor een vijver op de Wereldtentoonstelling van 1873 Kaiserpavillon mit Bassin Imperial Pavilion with pool Pavillon impérial avec le bassin (titel op object) Weltausstellung in W, RP-F-F10905Zoom in

Photo: Rijksmuseum · CC0 · via Wikimedia Commons

  1. 1Weathering · whole photoThe Imperial Pavilion over a pondThe stereo view shows the Imperial Pavilion behind a still pond, framed by full, mature trees whose crowns reflect in the water.The questionWere the grounds' trees planted for 1873, or were they already old when the fair arrived?

Related clues at other fairs

#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?Masonry, not plaster · London 1851Solid wall at the lower levelWhat is that masonry base, when was it laid, and did it carry an earlier 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?

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