Forty hectares of remains have been found in Alken Enge bog located in in the Alken Enge wetlands near Lake Mossø in East Jutland, Denmark.
Man has been killing man and beast since whatever critter of common descent crawled out of the primordial ooze. And likely before, there's just no way to know it.

But some things can be known and one of them is this; you don't manufacture poison unless you intend to kill something with it. And ancient man was interested in using the best applied science they could find. 
A  giant human sculpture has been unearthed at the Tayinat Archaeological Project excavation site in southeastern Turkey.

The head and torso of the human figure is intact to just above its waist and stands approximately 5 feet tall, so it likely had a total body length of 10 to 12 feet. The figure's face is bearded, with beautifully preserved inlaid eyes made of white and black stone, and its hair has been coiffed in an elaborate series of curls aligned in linear rows. Both arms are extended forward from the elbow, each with two arm bracelets decorated with lion heads. The figure's right hand holds a spear, and in its left is a shaft of wheat. A crescent-shaped pectoral adorns its chest.
The best stuff is found in Scotland.

And by 'best' I mean weirdest, like haggis, caber-tossing and 3,000-year-old mummies that turn out to be Frankenstein monsters.

Well, at least we know the ancient Celts weren't anti-science.  I mean, they created a Frankenstein monster and they figured out that high-acid, low-oxygen peat bogs are the perfect way to insure that future generations could enjoy their abominations of nature. That's pro-science.
Stonehenge is interesting, though any mystical (or downright alien) symbolism is lost when you visit much larger sites, like Avebury Henge, that are clearly not mystical at all. Because of its fame, people have long sought answers as to why Stonehenge was built.

A group of archaeologists now contend it was indeed symbolic - but not religious symbolism, it was more political.

The Dropa Stones are puzzling artifact #2 on the 10 Most Puzzling Ancient Artifacts list.

These are “The” Dropa Stone images.

What are the Dropa Stones?

I’ve seen this article several times now, and I meant to address it the first time, but then I got distracted by something shiny…er I mean work?

The coolest stuff regarding ancient religious history is not found in the Vatican or western Europe at all, it's in the East where a lot less modern growth took place.  There is more stuff that will be buried under the Ilisu dam in Turkey than in all of most countries farther west.  Almost every town in Turkey is a major archaeological site.

So it also goes with places like Bulgaria. I found a really wonderful Byzantine cross on a trip there, from the 18th century (unless you are doing it one time, to experience the paperwork and process of buying and bringing in an antique, I discourage you from doing so) and the place is littered with ancient monasteries and churches.
The remains of newborn twin girls have been found in the archaeological site of Sant Miquel d'Olèrdola in Catalonia and it is expected that they belong to two girls between 38 and 40 weeks of gestation, who were buried at the same time in the same grave with their legs entwined.

The remains date between the middle of the 4th century B.C. to the beginning of the 2nd century B.C. and are the first bone remains of twins to be recorded in the Iberian peninsula.
Ancient sunken ships are generally found in shallow water 100 or so, but two Roman-era shipwrecks have been found almost a mile deep in waters off the islands of Corfu and Paxoi, the Ionian Sea between western Greece and Italy.

The wrecks are from the third century A.D. and lend more evidence to the idea that bolder ancient shipmasters did not just stick to coastal routes and ventured into the open sea. Of course, since they are wrecks it also explains why more cautious trade captains absolutely did stick to coastal routes when they could.  Smaller vessels such as this, 80 feet long and usually loaded with cargo and not built for open water navigation, liked to be closer to land to save the crew if things went wrong.