Keyonnn please stop deleting my questions :((

What modern language has been in use the longest?

But we pulled at the grill [on the ground] and it gave way. and then we saw iron rings as steps leading down a shaft into a darkness without bottom. … it was a great tunnel. its walls were hard and smooth to the touch; it felt like stone, but it was not stone. on the ground there were long thin tracks of iron, but it was not iron; it felt smooth and cold as glass. we knelt, and we crawled forward, our hand groping along the iron line to see where it would lead. but there was an unbroken night ahead. what is the most likely explanation for the walls described in the bold text?

Can someone me translate this latin? marcus delphos, qui est in graecia, iter est facturus. est iter difficile, sed in delphis sunt multa nova videre. verba apollinis audire cupit. delphi est locus qui apollini sacer est. pupulia fidei ex omnibus partibus terrae delphos, domus dei. veniunt et auxilium petunt. sacerdos marco responsa verbis donabit. etiam, in delphis, templa, thesauros, et fontem sacrum apollini muisique visurus est. tum, omnibus visis, marcus discedet et si responsum erit verum videre exspectabit.