A cave or cavern was a large open underground space.

The First Doctor, Ian, Barbara and Susan in the Cave of Skulls. (TV: "The Forest of Fear")

The Tribe of Gum kept their prisoners in the Cave of Skulls. (TV: An Unearthly Child)

Barbara followed Tegana to the Cave of Five Hundred Eyes while in 13th century China. (TV: Marco Polo)

The TARDIS materialised in a cave near a beach when it arrived at Cornwall in the 17th century. (TV: The Smugglers)

The caves of Androzani Minor were used by Sharaz Jek as his base. (TV: The Caves of Androzani)

Eldrad with the Fourth Doctor and Sarah in the Kastrian thermal chambers. (TV: The Hand of Fear)

The Kastrian thermal chambers were a system of caves used by the inhabitants as shelter from solar winds. (TV: The Hand of Fear)

In the early 19th century, Lord Aldbourne and his followers played at devil worship in the cavern beneath the church at Devil's End. In the 20th century, the cavern was converted into a museum of witchcraft. (PROSE: The Eight Doctors)

In the 1970s, the complex in which Rudolph Steiner's Gemini Plan was being carried out had been built over a network of caves which had been an Aboriginal sacred place. The Third Doctor and Murray Stevens escaped from the complex into the caves, where they met with a group of Aborigines who agreed to help them defeat the plan. (COMIC: Gemini Plan)

Hetocumtek's totem pole was found in the 21st century, hidden deep in a cave in the Mojave Desert. (TV: The Curse of Clyde Langer)

In the far future, a cave was part of the artificial jungle aboard the Ark. The First Doctor, Steven and Dodo hid in the cave from a Monoid. (TV: The Ark)

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