Kilimanjaro, Tanzania

Mount Rainier, Washington

Mount Elbrus, Russia

Cotopaxi, Ecuador

Mount Fuji, Japan

Mount Shasta, California

6 Iconic Hikes You Should Do Before You Die

I believe Kili is the only one of those 6 that you MUST do with a guide.

Check our list of best trekking peaks. Kili and Ranier are on it.