It's indestructible because of magic.
Two Towers, Flotsam and Jetsam: "Many of the Ents were hurling themselves against the Orthanc-rock; but that defeated them. It is very smooth and hard. Some wizardry is in it, perhaps, older and stronger than Saruman's"
It was built by the guys in the second age who had access to more powerful magic than they do in the time of LOTR. If they could enchant Palantir to communicate instantly over vast distances, then why not a tower to be really strong?
As a side note, it is strong for the same reason the walls of Gondor are so strong. I don't have a quote for this but they are nigh indestructible.
RotK, The Siege of Gondor: "For the main wall of the City was of great height and marvellous thickness, built ere the power and craft of Númenor waned in exile; and its outward face was like to the Tower of Orthanc, hard and dark and smooth, unconquerable by steel or fire, unbreakable except by some convulsion that would rend the very earth on which it stood."
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