Cities have underground cities beneath them.

Many cities around the world have hidden underground networks, from abandoned tunnels and subways to secret passages and catacombs. These underground spaces serve various purposes, such as providing transportation routes, shelter during wars, or even clandestine meeting spots. Some cities, like Cappadocia in Turkey or Montreal in Canada, are famous for their extensive underground complexes that offer a glimpse into their rich history and unique urban development. Exploring these hidden spaces can unveil a whole new perspective on a city's past and present, showcasing the layers of history that lie beneath the bustling streets.