Krakatoa

Krakatoa was a volcanic island in the Sundra Straits in Indonesia. It erupted in 1883. (TV: Inferno, COMIC: Under the Volcano)

History
At least three incarnations of the Doctor were present at the eruption of 1883.

Some time prior to his third incarnation, the Doctor witnessed the eruption. During this event, he also heard Primords scream for the first time. (TV: Inferno)

The Ninth Doctor, having stolen a Time War weapon from Althea Bryce visited Krakatoa to bury the atmosphere destroyer, allowing its destruction during the eruption, 2 hours later. The weapon was actually part of a time loop, however, as a younger version of Althea Bryce later retrieved the weapon. (AUDIO: Her Own Bootstraps) A sketch of the Ninth Doctor was purported to have washed up on a Sumatran beach that day. It eventually found its way into Clive Finch's collection of artefacts related to the Doctor. (TV: Rose) When Rose Tyler informed the Doctor of this sketch, he sighed, expressing his disdain at having "one last bit of history left to fake". (AUDIO: Her Own Bootstraps)

The Tenth Doctor and Rose Tyler also visited the island, where they encountered the alien Chalderans. The Chalderans were trying to steal the magma from the core of the Earth, a process which would leave the planet dead. The Doctor and Rose escaped in the TARDIS, just as the eruption began, with the Doctor having tricked the Chalderans into drilling into the volcano, killing them all. (COMIC: Under the Volcano) The Torchwood Institute tracked the Doctor to Krakatoa after the eruption. (COMIC: The Time Machination)

The eruption powered the device which sent Gillian Petra to her native time period. (PROSE: Erasing Sherlock) It also freed a Xylok, who became Mr Smith many years later. (TV: The Lost Boy)