Magnificient cave Tu Lan, rarely known attraction, Vietnam

Tu Lan was discovered by local fishmen in 2009. Less known and far wilder than the well lit caves frequented by busloads of tourists, the Tu Lan system sits inside the limestone mountain range that surround the Tan Hoa village commune.

There is only one way into Tu Lan cave. You have to swim. Inside Tu Lan cave, many rocks look almost man-made -- rounded and patterned as if drawn on by cavemen. 

The dry cave at the end of system features a vast roof that lets the sunshine through two large opeings.

Photos of Thanh Nien online