United States,
Sweden,
France (Alpes),
Wales,
Scotland.
England.
Lots of effort in all the above countries, the US has enough trails to keep us trail busy for the rest of our riding days.
Sweden has some of the most remote trails, further north you go the more remote, where we holiday quite regularly they have a 150km trail which is awesome with everything in it.
French Alpes is a paradise for gravity assisted grins and grimaces for some of the most horendous climbs, but I think that they have (and have still) created some very good trails with scenery nearly as nice as the Lakes.
Hopefully most of us have ventured out and made the best of the last countries on my list, they all have something else to give us that is different to the one before but not a replica of some of the others.
Trails are trails to us all but I think it’s what we put into our adventures that make them or break them. Have fun !