Carsten Peter - Getty
Carsten Peter - Getty
Carsten Peter - Getty
Carsten Peter - Getty
Carsten Peter - Getty
Carsten Peter - Getty
Carsten Peter - Getty
Carsten Peter - Getty
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1. Son Doong Cave , Son Trach, Bo Trach,

Located in the Quang Binh province of Vietnam, Son Doong (which means "mountain river cave") is the largest cave on Earth, measuring in at more than 856ft wide, 492ft high, and nearly six miles long, and now it's open for tourists!