Cape Wrath Ultra in Scotland, an epic trail run of 400 kms divided over 8 days. Goes through some breathtaking scenery of Scotland, hills, water streams, mountains, valleys etc. quite magnificent landscape.
Guess going forward trail running will be the most favored one because you have less number of participants, you go through some breathtaking trails, you feel with nature, you breathe the fresh air of the mountains. City running with thousands of running jostling with each on narrow streets are going to be passe.