https://asm.ca.com/en/ping.php
This is a site which lets you ping from 90+ locations around the world, but since they show the IP that is resolved for each location, a nice side effect is that you can see if a site is censored by DNS hijacking.
For example, porntube.com has the IP 104.18.147.225 for the large majority of results, but these differ:
China - Hangzhou (cnhgh01) 69.171.244.15
China - Beijing (cnbjs02) 69.63.184.142
Indonesia - Jakarta (idjkt02) 1.2.3.4
I checked a couple of my sites and they're blocked.