Throughout aviation history, what airships were built with metal skin instead of fabric or other material?
At least two all-metal airships are known to have existed, the first one invented by David Schwarz, and test-flown in Tempelhof, in 1897. It flew, but crashed when landing.
Another one, a really successful and better known aircraft, was an American airship, the ZMC-2, that first flew in 1929.
There is a metal airship currently being built by an Englishman in France, called the VariaLift. https://www.varialift.com/
The specifications are as follows:
There was no stipulation on whether the airship had to carry anybody. This Myth Buster experiment successfully flew a very large LEAD balloon (30-50ft dia).