A little more than a month ago, I commented on a story about exploring underground New York City. The latest issue of National Geographic has a similar story: underneath Paris is a complex system of tunnels, abandoned quarries, and catacombs.

Although I have not been to Paris, this article makes the catacomb tours sound fascinating. Perhaps other cities, like New York or Chicago, could put together underground tours to generate some extra income. While American cities wouldn’t have centuries of bodies beneath them, I would guess that there would be plenty of people interested in such a tour.

On the whole, this article about Paris makes the underground world seem whimsical and liberating. The article ends with the idea that people go underground to escape the restrictions and expectations of the above-ground world. Are there downsides to these places or the people who explore them? And does Paris have people living underground, like New York City and Las Vegas?