The Xiaozhai Tiankeng (小寨天坑), also known as the Heavenly Pit, is the world's deepest sinkhole [read more: ]
The Xiaozhai Tiankeng (小寨天坑), also known as the Heavenly Pit, is the world's deepest sinkhole
The Xiaozhai Tiankeng (小寨天坑), also known as the Heavenly Pit, is the world's deepest sinkhole