Have you ever been to a place that had a marker denoting a geographic wonder, such as the equator, the Continental Divide, or the geographic center of some land mass? The chances are good that it's not quite accurate. Sometimes markers were put in a convenient location somewhat near the actual spot. Sometimes they are monuments to the difficulty of geographic mapping, and turns out to be a mistake. And some were pretty accurate in their time, but the world has a way of changing. All these reasons are represented in this list. Europos Park in Lithuania is an example.
In the early 1990s the people of Lithuania got very excited when calculations identified a spot outside the capital city, Vilnius, as the dead center of Europe. A big sculpture park dubbed Europos Park was erected at the spot. But French scientists who had proposed the spot for the center in the first place sent news that they accidentally missed the exact target by 8 miles (14 kilometers). The correct center, which is still contested, is now marked with a square and a small museum.
And then there are those that are inaccurate and we really don't know why. Read about eleven such markers at Atlas Obscura.
(Image credit: Atlas Obscura user Ahvenas)