I've found it somewhat entertaining reading about the darker episodes of human history for some reason, like how life in the Middle east was 2.5-3'000 years ago. People sacrificing their firstborn children to their god at "tophet" places, something the Phoenicians were the most notorious for doing, but that the Israelites also indulged in at the valley of Hinnom, south of Jerusalem, called Gehenna in Greek. Some people believe they even did it in the name of Jehovah, mainly based on how Jeremiah 7:31 reads:
"And they have built the high places of Tophet, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire; which I commanded them not, neither came it into my heart. "
It's also amusing to read about the brutality Assurnasirpal II practiced, an 8th century BC Assyrian king - he wrote chronicles on how he slaughtered the people in the cities he conquered and organized their body parts into neat piles, and even flaying the skin off living humans.
Such brutality is awful of course, but I think what fascinates me about it is that back then, people were honest about their barbarian nature, while people aren't now even though they really haven't gained much in the way of civilization. Today we instead have hypocrisy along the "we're killing them for peace and democracy" lines..