> Every major city has tours in tunnels and are usually pretty cool I agree. Edinburgh has some amazing ones under The Royal Mile. The Paris ones used to be q

> Every major city has tours in tunnels and are usually pretty cool I agree. Edinburgh has some amazing ones under The Royal Mile. The Paris ones used to be quite extensive but the comments here make me wonder if they have been shortened? The catacombs in Lima gave me pause. The environment there is very dry and so decomposition is presumably slowed. There was a very distinctive smell.