7. Annapurna Circuit, Nepal
It can take up to three weeks to finish this impressive trek through Nepal’s Annapurna mountains. With elevations peaking at nearly 18,000 feet, this trail certainly isn’t for the faint of heart. Along the way, you’ll see sites holy to both Buddhists and Hindus, rice paddies, the world’s deepest gorge, subtropical forests, and countless waterfalls.