The scenes in the mine are filmed in Slade, Kentucky and you can visit it and take a tour of inside the mine. There are two different touring companies, The gorge underground & SUP Kentucky.
There are presently nearly 50 coal seam fires occurring across the planet. They add significant amounts of toxins into Earth's atmosphere.
Her biography states that Alicia Sanz was born in Ceuta Spain. Ceuta along with Melilla are two Spanish cities which are NOT in Spain. They are both on the Mediterranean coast of Morocco. Spain refused to give up these two cities when Morocco gained its independence. Morocco claims sovereignty over Ceuta and Melilla which are physically located in Morocco but without success. Compare this situation to Spain's claims to Gibraltar which is a British colony on Spain's Mediterranean coast almost due north of Ceuta.
The " Well to Hell " is an urban legend that dates back to the late 1980's.
In the very early 1800's The Lewis and Clark expedition (of what would later become the
Central and Western United States) reported seeing coal seam fires.