Dark side of the Moon

The dark side of the Moon was the side of the Moon which faced away from the planet Earth. (COMIC: Death to the Doctor!)

History
After the Millennium War of 150 million BC, one of the few remnants of the Constructors of Destiny was the Midnight Cathedral on the dark side of the Moon. (PROSE: The Quantum Archangel)

In 1878, as Queen Victoria watched, three British spacecraft - the Cygnus, the Draco and the Lynx - were launched in secret from rural Scotland on an expedition to the dark side of the moon which resulted in the discovery of a lunar park erected by an unknown alien civilisation for the purpose of hunting. During the expedition's efforts to rescue their missing commander - aided by the Fifth Doctor, Turlough and (secretly) Kamelion - the park was destroyed after the death of the park's Warden. The last surviving inhabitants of the Park were the ruthless Vrall, who tricked the humans into bringing them to Earth only to subsequently be destroyed by the Doctor and his companions using weapons salvaged from the park. After Kamelion visited Victoria in disguise as Prince Albert, Victoria was convinced to end the British Imperial Spacefleet due to the potential dangers of space travel, the Doctor having concluded that Victorian mentality was ill-suited for the pressures of space travel at this time. (PROSE: Imperial Moon)

In 1941, a Dalek flying saucer was hidden on the dark side of the moon. (TV: Victory of the Daleks)

By the late 20th century, the Cybermen of the "Early CyberFaction" from Planet 14 had established a base on the dark side of the Moon. The base served as the staging area for a fleet poised to invade Earth. It also could fire missiles at approaching craft, such as the Doctor's TARDIS, which briefly materialised in space nearby. (TV: The Invasion, AUDIO: The Ultimate Cybermen)

Bolog had the whole Reptilios Invasion Fleet concealed on the dark side of the Moon, only for the Fourth Doctor to send them into orbit around the Sun using a banana. (COMIC: Death to the Doctor!)