Runamo

From the longer Wikipedia page 
Runamo is a cracked dolerite dike that was for centuries held to be a runic inscription and gave rise to a famous scholarly controversy in the 19th century. It is located 2.7 km from the church of Bräkne-Hoby in Blekinge, Sweden. For hundreds of years people said it was possible to read an inscription, and learned men referred to it.
In spite of a report by Saxo Grammaticus report that the inscription was illegible as early as the 12th century, the Danish physician and antiquary Ole Worm declared in the 17th century that he had managed to read four letters in the description: Lund.
There was considerable interest in the inscription during the Gothicismus of the early 19th century. The Swedish writer Esaias Tegnér referred to it in his unfinished poem on the giantess Gerðr and Axel who became bishop Absalon of Lund.
 
The famous Swedish chemist Jöns Jakob Berzelius claimed that the inscription was only natural cracks in the rock.In 1833, the Royal Danish Academy of Sciences and Letters sent an expedition led by an Icelandic professor at the University of Copenhagen named Finnur Magnússon. The mission was to explore the signs making use of geological and artistic expertise, including the geologist Johan Georg Forchhammer. At first, Finnur was unable to read the signs, but resolving to read them from right to left and by interpreting most of them as bind runes, he believed he discerned a poem. This poem was an incantation by Harald Hildekinn (sic.), i.e. Harald Wartooth, for victory against the Swedish king Sigurd Ring at the Battle of Brávellir, or stanzas from the skaldic poem that the champion Starkad composed on the battle
Finnur's report prompted the famous Swedish scientist Jöns Jacob Berzelius to undertake his own study in 1836, and he concluded that the inscription was nothing but natural cracks in the rock. Finnur defended his thesis in an extensive publication in 1841, but the Danish archaeologist Jens Jacob Asmussen Worsaae made a third study at the location in 1844, which turned the general scholarly opinion towards Berzelius' theory. Since then, it is generally considered to be a dolerite dike with cracks.
More information on the Swedish Wikipedia page .
There is various other coverage eg and .
Category:Archaeological errors
Category:19th century