I just finished reading
The Deltoid Pumpkin Seed, John McPhee's 1973 account of a company (Aereon) attempting to develop a new generation of rigid airships. If only the Zeppelins hadn't used (what we now know was) explosively flammable paint, air and freight travel today might be radically better. They successfully design, simulate, build, and test fly a small scale (26 ft. long) version of an "aerobody", a powered dirigible with a shape like a lifting body; it's quite an intriguing story.
The full scale versions would have been the size of a football field on up to an ocean liner and capable of carrying enormous amounts of cargo, with longer range, and at considerably less cost (and energy use or carbon footprint) than what we use today. Alas, it was not to be.
One interesting fact pointed out is that, following WW1 & the U.S. wouldn't sell helium to Germany, forcing them to use hydrogen (apparently this was a policy decision and not a condition of the Versailles Treaty). Further, though this was a factor in the Hindenburg disaster, it has now been demonstrated (on Mythbusters, no less!) that static discharage setting off the Titanium Oxide lacquer was more likely the ignition point.
The book includes a number of testimonials to the capabilities of the great airships, both from the days of the U.S. Navy fleet and from zeppelin passengers. They had the ability to fly in conditions that would cripple most aircraft: flying in blizzards, encrusted with tons of ice, flying with so much stability that an inverted bottle didn't tip over on a trip across the Atlantic.
Remarkably, the company profiled in the book still exists. You can read more about it (and see a picture of their craft taking off) here.