According to one AllTrails list.
It includes both challenging multi-day and short single-day adventures.
Our favourites from this list are in bold.
- Bhutan Snowman Trek
- Grand Canyon Rim Trail
- PCT – Rainy Pass to Manning section
- Yosemite Grand Tour
- Chilkoot Pass Trail
- Tonquin Trail, British Columbia
- Bay of Fires Walk, Australia
- Queen Charlotte Track
- Na Pali Coast / Kalalau Trail
- Tour de Mont Blanc (TMB)
- Long Range Traverse, Newfoundland
- Laugavegur Trail, Iceland
- High Sierra Trail, Crescent Meadow to Whitney Portal, California
- Routeburn Track, New Zealand
- Carlops to Currie, Scotland
- Laguna de Los Tres, Patagonia
- Petra, Jordan
- Cinque Terre, Italy
- Ruwenzori Mountains Trek to Weissman’s Peak, Uganda
These lists are far from definitive. They are more conversation starters to get you thinking where you might want to go next.
For example, the Tonquin Trail is a 4.0-km out-and-back trail near Tofino on Vancouver Island. I’m on the island right now and can name easily a dozen better hikes close by. 
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