Muong Tinh cave in Dien Bien province
National revolutionary historical monument of Muong Tinh cave in Dien Bien province is an invaluable asset, contributing to Dien Bien Phu victory that ends French colonial rule in Vietnam.
The middle compartment is about 20m2, surrounded by stone walls with stone holes which used to be venues for hiding documents and act as escape routes. The third compartment is about 30m2 wide (Photo: VNA)