7. Hang Son Doong Cave in Vietnam must have one hell of an echo.
This image appears in the gallery:
Weird & Wonderful Pictures Of The Week - 14 February 2014

9. 7. Hang Son Doong Cave in Vietnam must have one hell of an echo.
Picture: Reddit
This image appears in the gallery:
Weird & Wonderful Pictures Of The Week - 14 February 2014
Picture: Reddit