as a complement to Steve's answer:
Distance to any host -'- H
The -H option enables hosting, allowing the recursive run of Wget to visit any host referenced by the link. If sufficient recursion restriction criteria are not applied, these external hosts will typically contact even more hosts, and so on, until Wget collects much more data than you expected.
, -'-D
"-D" , , , . , '-H.
"www.server.com", "images.server.com ..":
wget -rH -Dserver.com http://www.server.com/
, ,
. "-Ddomain1.com, domain2.com.
: wget