Autobot Mausoleum

The Autobot Mausoleum is the final resting place of the chassis and servos of fallen Autobot heroes. It is a large barge set adrift in deep space. Inside, you can find the memorial known as the Veil of Remembrance.

The Transformers cartoon
While being pursued by Galvatron, Rodimus Prime and his crew had to ditch their starship and take refuge on the Autobot Mausoleum. Inside, they were surprised to find Optimus Prime seemingly alive, if not entirely well. In truth, he was little more than a reanimated corpse, courtesy of the Quintessons. The Autobot Mausoleum was destroyed when the zombie Optimus Prime set the self-destruct.

Animated
The Autobot Mausoleum exists in the Hadeen System, not far from Cybertron.

Knights of Unicron
The Veil of Remembrance, located on the Autobot Mausoleum, was the tenth venue for the Knights of Unicron on their 2014 "Till All Are One" tour.

Transformers Legends
Rodimus Prime, Arcee, Ultra Magnus and Spike Witwicky sheltered in the mausoleum under suspiciously familiar circumstances, and discovered that Optimus Prime had come back to life.

Transformers: Unicron Trilogy
Megatron visited the Autobot Mausoleum with Dreadwing to remove Liege Maximo's arm in the tomb, which would allow him to use the Forge of Solus Prime. With the arm, he used the Forge to craft the Dark Star Saber.