The Dolomites on the northern border of Italy and Austria are really special, a playground for hiking, rock climbing, canyoning and Via Ferrata. There are via Ferrata in France and Switzerland too, but to me these seem less genuine, designed more to scare tourists than for those who actually enjoy mountains.
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I've brought together an index of about 100 via Ferrata routes in the Dolomites, not because you can't find these elsewhere, but simply in frustration at not being able to consistently get GPX files and sort routes by grade or area (which is really handy when the weather turns or your chosen route is too busy).

Enjoy!