Son Doong Cave Expedition Wine

The world's largest cave - so big it has its own weather system, jungle, and river. A 4-day expedition that costs $3,000 but is the ultimate Vietnam adventure. Champagne at the finish.

Insider tips

• Book 6+ months ahead - only 1,000 permits per year

• Physical fitness required - 25km of trekking

• Champagne is provided at the exit - they think of everything

• This is a once-in-a-lifetime, save-up-for-it experience