Montreal, Quebec, Canada
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Montreal Biosphère fire, 1976

It's a Buckminster Fuller kind of a Tuesday.

Here's a famous geodesic dome: the Montreal Biosphère (not to be confused with the Montreal Biodome). It was built for the 1967 Expo.

"The building originally formed an enclosed structure of steel and acrylic cells, 76 metres (250 ft) in diameter and 62 metres (200 ft) high. The dome is a Class 1, Frequency 16, Icosahedron. A complex system of shades was used to control the internal temperature." (via Wikipedia article: http://en.wikipedia.org/wiki/Montreal_Biosph%C3%A8re )

In the afternoon of the 20 May 1976, during structural renovations, a fire burned away the building's transparent acrylic bubble, but the steel truss structure remained.

Montreal Biosphère fire, 1976