Possible Evidence of Time Travel

There has been a few interesting cases were archeologists have dug up some very strange thing like this for example Evidence of time travel. They found a watch made from this time period 400 years ago it even said "swiss" on it, when Switzerland wasn't even a country yet. Here is a website that also has some unexplained cases of possible timetravel http://www.ayeladdy.com/article.php?story=20071011202341211. Then there is the famous John Titor story, with all these cases I am starting to seriously wonder if we actually have been visited by time travelers.