I won't do catacombs (I'm claustrophobic) and in any event they were closed on our last trip (my husband would have gone). We went to the Sewer museum instead and I found it fascinating!!! Both my husband and I did - I loved it for its historical & public health displays, and my husband loved it for engineering. https://en.parisinfo.com/paris-museu...gouts-de-Paris

(yes, I was worried I'd be claustrophobic there too, but asked - maybe here? - and was told quite correctly that there is plenty of space and no tight tunnels necessary....)