The Son Doong Cave in Vietnam is the largest known cave chamber in the world.
The Caves of Aggtelek Karst and Slovak Karst in Europe are listed as UNESCO World Heritage Sites.
The Waitomo Glowworm Caves in New Zealand are famous for their unique glowworm population.
The Eisriesenwelt Ice Cave in Austria is the largest ice cave in the world.
The Sarawak Chamber in Malaysia is the largest known underground chamber in the world.