Treawtha was a small village near the coast of Cornwall, England.
History
In the 19th century, Tobias Philby purchased a nearby manor for building his Time machine. The villagers mistook his experiments for black magic and their suspicions were apparently confirmed when Billy Truscott witnessed Philby's vessel and the Doctor's TARDIS materialising. Despite the Third Doctor's attempt to dissuade them, the villagers, spurred on by the rector, went to the scientist's home and set it on fire, burning it to the ground. (TVC: The Amateur)