Not everyone died.  Those who listened to God’s instructions were saved, even though this only consisted of one family on the entire planet.

After the flood where God used the man named Noah to preserve humanity on the aforementioned ark, Noah’s great-grandson, Nimrod, led mankind in rebellion against the very God that spared the planet, resulting in the construction of which famous site judged by God?

-The Great Pyramid-

-The Walls of Jericho-

-The cities of Sodom and Gomorrah-

-The Tower of Babel-