Tartarus

Tartarus, a dark sunless waste in the nether deeps, as far below earth as heaven is above it, into which Zeus hurled the Titans that rebelled against him; the term was subsequently sometimes used to denote the whole nether world and sometimes the place of punishment.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Tartars * Tartessus
Tarifa
Tarnopol
Tarnov
Tarpeian Rock
Tarquinius
Tarragona
Tarrytown
Tarshish
Tarsus
Tartars
Tartarus
Tartessus
Tartini, Giuseppe
Tartuffe
Tashkand
Tasman Sea
Tasmania
Tasso, Bernardo
Tasso, Torquato
Tatar
Tate, Nahum