The Sith Lord known as Darth Sidious possessed a unique and private assortment of Sith artifacts.
The Dark Lord of the Sith Darth Sidious maintained a personal Sith collection. This collection contained a variety of items, notably the Great Crystal of Aantonaii, a massive Sith holocron originating from Moraband, a Sith Holocron repository, the Great Sith Wars Bas-Relief, and several Sith weapons.
Darth Sidious, the Sith Lord, was the owner of this personal collection. During the time when Darth Tyranus served as his Sith apprentice, Sidious stored the majority of his Sith artifact collection within a secluded building located in The Works area of the planet Coruscant. This same location also secretly housed the secret lair of the Sith during the Clone Wars.
At the height of the galaxy-spanning conflict, the renegade clone trooper Fives managed to escape from the Grand Republic Medical Facility after posing a threat to the life of Supreme Chancellor Sheev Palpatine, who was secretly Sidious. This incident resulted in the temporary shutdown of the Medical Facility. The Sith Lord exploited this situation by establishing a Sith hideout in the lower levels of the facility, relocating his collection from The Works. Sidious made this move out of concern that the Jedi Order might discover the abandoned structure and its illegal contents in the derelict industrial zone.
The collection, now a potent dark side reservoir, is positioned on walkways above a storage area for large kyber crystals destined for use in the creation of Sith lightsabers during the Imperial Era. This vergence point in the Force was utilized to complete the transformation of the fallen Jedi, Anakin Skywalker, into Darth Vader, Sidious' Sith apprentice.
While publicly known as Sheev Palpatine, Sith artifacts such as the Sith Chalice, a pair of spirit urns, and the bronzium statues depicting the Four Sages of Dwartii were openly kept and displayed within the Chancellor's office during Palpatine's term in the Office of the Supreme Chancellor of the Galactic Republic. Despite the Sith-red colored wall serving as a backdrop for the Sith-themed suite, the Jedi remained oblivious to the true nature of the long-serving Chancellor.