http://maldomapyy5d5wn7l36mkragw3nk2fgab6tycbjlpsruch7kdninhhid.onion
To our knowledge, it is the largest and most detailed network map for Monero or any other privacy coin. There are other maps worth mentioning, such as monerohash.com/nodes-distribution and monero.fail/map . Though it is not a map, we find xmr.ditatompel to be an interesting remote node monitor and recommend checking it out as well.