Who built the first house? We will never know. One of the oldest known houses dates back 380 thousand years. It was a hut, built by homo erectus not far from the sea, in the area in the South of France now called the "Côte d'Azur". The history of humanity is also the history of the shells that man has built for himself to live better: from huts to imperial palaces, from igloos to skyscrapers. A story full of surprises and curiosities; from the first huts to today's megacities. Let's take a brief history of the habitations of our planet. We then follow the construction of one of the most beautiful castles in the world, that of Versailles in France, commissioned by Louis XIV, the Sun King. We will see how we lived in our homes until a few decades ago. Alberto Angela takes us 'behind the scenes' of one of the tallest skyscrapers in the world. Rome with its most famous monuments is an emblematic case of use and reuse of spaces and materials over the centuries.