In 1990, a local man named Ho Khanh found the entrance to Son Doong in Vietnam; in 2009 British cavers confirmed it as the world’s largest known cave passage, big enough to hold its own jungle

Venture into the depths of Vietnam’s Son Doong Cave, where a hidden world unfolds beneath ancient limestone. Initially stumbled upon by Ho Khanh in 1990, it wasn’t until 2009 that this enchanting cavern was fully mapped, revealing colossal rock formations and a flowing river carved by nature over eons. Since 2013, tours have allowed adventurers to glimpse this delicate ecosystem while promoting sustainable tourism efforts.