Today he is heading to Hanoi, the capital of Vietnam. On a journey to see its tunnel houses, these homes are in the heart of the old quarter and combine trade activity and a family home in the same space. Called tunnel homes due to their narrowness and depth, sometimes these homes can go up to five stories high. Next, Philippe heads to Kandovan, a village in the East Azerbaijan Province of northwestern Iran. Thousand-year-old volcanic eruptions created cones of rock that are now carved out in what is called a troglodyte dwelling, some of the oldest dwellings in the world.

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