Titanic Balloon!
The picture shows a superpressure balloon in a hangar in New Zealand in 1960. One of these atmospheric monitoring balloons managed to stay in the air for over 2 years, orbiting the earth more than 70 times.

http://www.oobject.com/interesting-balloons/ncar-superpressure-balloon/1795/

http://www.oobject.com/interesting-balloons/ncar-superpressure-balloon/1795/
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