Out of Place
I love "out of place" artefacts. 
Atheists and evolutionists can't explain them, and it's an embarassment to them, and their 'scientific' studies.
Here are a few:
London Hammer
Clearly a pre-flood hammer that got stuck in a rapidly forming rock. 'Scientists' however believe the rock is 400 million years old (way before evolution even started).
- By S. J. Miba / Wikimedia Commons / CC BY-SA 4.0
Bell Found in Coal
The coal was estimated to be 300 million years old (way before evolution even started).
Other things, such as jewelry, were also found in coal.
Mayan Airplane
Here's a Mayan airplane (maybe a model, or a toy, etc).
Someone made a remote controlled model airplane from it, and it actually flew.
Live Pterosaur
Although quite controversial, I really like this picture of a pterosaur (supposably from a newspaper in 1864). It was deemed genuine by several experts some time ago, but the discussion as to whether it's real is still going. You might also like this website about Pterosaurs in general.
I have decided to add it to this article nonetheless, because people have reported these kind of sightings for centuries, and who knows?
It's quite detailed really.
For a hi-res version, please click here.
There is also a fake version available of this, but it's not as good as the picture above.
Decide for yourself. 
Other
There are plenty more "out of place" artefacts. Most of them can be traced back to ancient civilizations, and the Flood. If you're interested in learning more about these artefacts, please click here.
There's also a YouTube video that features the hammer, and the still working bell.
You can't make this stuff up.