Is there a mention of anything similar to a ragnarok type end-of-the-world thing in greek and roman mythology?

Answer 1

There is no projected end in either Greek nor Roman mythology.
The only parallel are actually the Jewish and Christian prophecies about the end of the world.

I think that the collector/writer of the Edda, who wrote in Christian times, was influenced by those, and/or recent or contemporary (to his time) poems, rather than a genuine, old Germanic prophecy of the world's end.

Answer 2

There was no end of the world. But in classical mythology the world has ages, and they come to an end:

See:
The Ages of the World:
http://www.maicar.com/GML/AgesOfWorld.html

A lighter version:
http://www.maicar.com/GML/AgesOfMan.html

The myth of the Flood could be related. See:
http://www.maicar.com/GML/Flood.html

Answer 3

Since everyone for those time period stole each other god's yes in thier mind everything was connected...........................................