In reply to olek632:
I agree it's an amazing race, slightly earlier in the year so longer daylight and potentially less hot although when I did it, it was too hot and I abandoned with heatstroke 10k from the end. However I would caveat that it's a really hard race - for a 90k it packs in a lot of challenging vertical so probably one to build up to or risk getting spat out.
Someone mentioned the UTMB some might say predictably but I really enjoyed it, and the points system ensures you get to build up to it and pick so interesting races.
Shameless plug: To the OP, if you're looking for a fun European one with UTMB points as a bonus my running club in the Vercors run this every year and I strongly recommend it if you're just getting started on European mountains as it's fairly low key, challenging but stays below 2000m, and friendly.
https://www.ultratrailvercors.com/
I've written a few race reports on my blog at https://mountaintrailrunning.com over the years so maybe some inspiration there.
I'm taking an easy year this year but my future bucket list includes the Échappée Belle, Haute Trail Vanoise (had to miss it last week because of my mum's funeral) and maybe in the longer term TdG or even PTL.