Many dispute the modern scientific tests that have proven it to be a medieval fabrication , and crowds of faithful and merely curious still visit its black marble chapel , a masterpiece of Guarini 's High Baroque , with its cone-shaped , six-tiered dome formed by a web of intersecting arches that rise to a 12-pointed star .
Many disagree with the results of the scientific tests which have shown that it is a falsehood from the medieval era .