A graveyard, also known as a cemetery, was a place where the remains of dead people were buried.
In Cornwall, in the 17th century, the First Doctor, Ben Jackson and Polly Wright searched for clues about a treasure in a church graveyard; they found them on the gravestones, which led them to the church crypt. (TV: The Smugglers)
In 1997, when Mordred, a knight from an alternate Earth, fought on the sacred soil of a church graveyard, construed as "a shrine to those fallen in battle", Morgaine banished him for dishonouring the dead. (TV: Battlefield)
In 2012, the Eleventh Doctor and Amy Pond landed in a New York City graveyard when they tried to go to 1938 to retrieve Rory Williams, who had been transported there. When Amy and Rory were permanently transported to the past by a Weeping Angel, they were buried in the same graveyard when they died. (TV: The Angels Take Manhattan)
Around the 2010s, the dead rose from their graves as Cybermen. Danny Pink, retaining control himself as a Cyberman brought Clara Oswald to a cemetery where the dead were still rising as Cybermen. There, he sacrificed himself to save the world by flying the Cybermen into the rain clouds and self-destructing, burning up the clouds. As the Doctor prepared to kill Missy, the Brigadier, now a Cyberman himself, appeared to kill her and spared the Doctor from having to commit murder. He also dropped off his daughter who he had saved from death. (TV: Death in Heaven) Missy had in fact survived, having used the energy from the blast to power her vortex manipulator to teleport away. (TV: The Witch's Familiar)
In 2020, the Eleventh Doctor, Amy Pond and Rory Williams visited the graveyard in Cwmtaff, where the Doctor found patches of blue grass and Rory learned that graves were being robbed. (TV: The Hungry Earth)
During the Last Great Time War, the War Doctor and Cinder visited a graveyard under the Citadel, where dead and dying TARDISes were hosted. The Doctor's TARDIS was taken there in order to be destroyed. (PROSE: Engines of War)