You've heard about the sword in the stone. Well, what about the sword in the sewer?
Engineers in Denmark have found a medieval sword, in a sewer, which dates all the way back to the 1300s.
Amazingly, the sword is in good condition and is still really sharp.
The sword was found in a layer of waste in the sewer and no-one's really sure how it ended up there.
Archaeologists think the double-edged blade belonged to an elite warrior of the time.
That's because swords were really expensive in the middle ages and only the most elite fighters - like people born into the royal family - could afford to carry one.
The battle scars on the weapon suggest that it was used in at least three or four massive wars.
The sword is going to be on show at the Nordjyllands history museum in Aalborg, Denmark.