They've been discovered at Roman-era sites, but no one knows what they're for.
They've been discovered at Roman-era sites, but no one knows what they're for.
25 Mysterious Findings On Earth That Even Scientists Can't Explain
Top 10 Mysterious Archaeological Discoveries That Still Baffle Scientists - Listverse
Blogworthy: Science Fiction Art Book, Roman Artifacts, Super Earths, Baloney Detection Kit, New D&D Character Options - Nuketown
The aircrashes are predictable!
Enigmas Roman Dodecahedron Uncovered by Amateur Archaeologists in the UK - Arkeonews
The Phaistos Disc: one of the greatest unsolved mysteries of the ancient world - History Skills
Researchers Baffled By 'Golden Egg' Found In Gulf Of Alaska
Archaeologists baffled by mysterious Anglo-Saxon artefact
5 Mysterious Artifacts No One Can Explain
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