Why are people from around the world making sure the holocaust is not forgotten?

It was because holocaust was one of the most terrifying period of time in history as it stands out as a cruel vicious action fueled by irrational hate and racist ideas. The Holocaust reminds us the depths of human cruelty and move us to take action against violence and abuse.

The Holocaust was a horrific event. Over six million Jews died, other 5  million non-jews also perished. This happened as nations stood by while millions were murdered in the most inhumane ways and did absolutely nothing. The reason people around the world are putting this in remembrance is to recall and make it live the pain that millions of innocent people went through and to ensure that this will never ever happen again. 

C. Concrete, roads, and domes

Explanation:

The Ancient Romans were brilliant builders. They were advanced in technology and made inventions of concrete, roads, domes, arches, and aqueducts.