It's not quite a trip around the world, but a trek that Norway's Zero team recently undertook in a pair of hydrogen-fueled cars is certainly an impressive enough feat in its own right. Late last month, they drove two Hyundai Ix35 FCEVs from Oslo to Monte Carlo (admittedly one of the easier ways to technically "cross Europe"), relying solely on the existing hydrogen refueling infrastructure -- that's as opposed to other trips that brought along fuel trucks as backup.
Careful investigation of the Hindenburg disaster verified the opinion of the engineers on the Hindenburg and proved that it was the flammable aluminum powder filled paint varnish that coated the infamous airship, not the hydrogen that started the fateful fire.
As eyewitnesses noted, the hydrogen fire started considerably after the Hindenburg’s surface skin started to burn and was over in less than one minute. The diesel fuel and other heavier-than-air components of the Hindenburg continued to burn many hours on the ground.