The book The Neanderthals by Friedemann Schrenk and Stephanie Mu"ller (English translation, 2009) has a map showing Petralona and Apidima (in the Peloponnesus) as locations where evidence for Homo erectus or Homo heidelbergensis was found but they don't elaborate in the text.
I assume the find of Neanderthal footprints is a more recent discovery.
Mousterian artifacts are associated with Neanderthals so sometimes they can tell the Neanderthals were present because of the artifacts even if they don't find bones or DNA.
Yes, it is a new find not verified yet. I will try to find it again. I could be wrong but my memory is pretty good. I probably just dismissed it because of the pending verification.
The sheet music for “Girl from Apidima” was found in that dig, I think the fossil skull was dubbed “Hetero Erectus”. /rimshot
https://www.britannica.com/topic/Petralona-skull
http://blogs.discovermagazine.com/deadthings/2019/07/10/apidima-skull/