Annapurna I is the hardest of the 8000 meter climbs and one of the deadliest per attempts due to avalanches. Would love to just go to base camp one day to see it. The Matterhorn is amazing in person I have been fortunate enough to see it. The reason it has so many deaths is because it’s fairly accessible and seen as an “easier” yet challenging climb so you get tourist climbers training for two months and thinking it’s not that hard.
You can't tackle the Matterhorn without a guide these days; and the foot traffic up the mountain during the summer has choke points, with delays of hours. Most don't go right to the top because the higher reaches require pitons and ropes, with one section hanging off the backward leaning cliff face.
The cafe, half way up, does a roaring trade - it is supplied by Air Zermatt's helicopters.
Best to see the thing from the Gornergrat. It's a lovely run on the train up to the Gornergrat, with the chance of spotting Marmots and deer along the way, in the warmer months.