The life of the 5th Duke of Portland is a story about the mental obsession to find a haven of absolute stillness, a worry-free place, and somewhere to feel safe (Pl L1/2/8/3/13: Four letters to Fanny Kemble, 1842–1845. In these letters, the 5th Duke refers to the subsoil as “shelter” and the “only safe place”, found in Manuscripts and Special Collections, Archives Nottingham University). Perhaps it is there, in the space that unfolded away from the visible world, that he found the strength to overcome his difficulties and to understand the scale of space and its intangibility; he was aware of the relationships and interaction between the human body, inhabited space, and the mind, and this information helped him in his hiding process. After his appointment as the heir to his immense estate, a series of investments on an unprecedented scale began almost immediately, which have been considered, both technically and conceptually, to be pioneers of domestic and landscape architecture during the nineteenth century. Welbeck Estate represents the construction of a double city, one that is visible and another that is concealed, but it is also a reflection of how our body and our mind interfere, dialogue, and create an architectural space that is framed in a cognitive process. Space and time were unfolded and folded into themselves in order to build this fascinating scenery, which represents the duke’s life.