Hanoi( CNN) I’m standing in a darknes, big chamber in Hanoi’s Hoa Lo Prison, where Vietnamese prisoners were once held by the French.

Mental strength was key for these prisoners, she says, as they plotted and schemed escapes from within these gloomy walls.

It’s a sobering look at the brutal impact of French rule in the two countries( 1887 -1 954 ).

Is this the world’s cheapest draft beer?

In Hanoi, it’s all about egg coffee