Monaco Is A Vertical City Built Into Cliffs
Because Monaco has almost no flat land, its buildings are literally carved into steep mountainsides. This geography forces the nation to grow upward and inward, creating a dense landscape where space is more precious than gold.
The country faces a constant struggle for room, leading architects to design complex structures that burrow deep into hillsides or hover over narrow coastlines. This cramped environment means that even minor construction projects can trigger major social tension among residents. To keep up with demand, Monaco has even resorted to land reclamation projects to expand its tiny territory into the sea. It is a fascinating example of how extreme geography dictates the entire lifestyle of a sovereign state.
Source: Architecture of Monaco