The Dark Lord of the Sith Darth Sidious kept a private Sith collection which consisted of many items, including the Great Crystal of Aantonaii, a massive Sith holocron from Moraband, a Sith Holocron repository, the Great Sith Wars Bas-Relief, and numerous Sith weapons.
The personal collection's owner was the Sith Lord Darth Sidious, who, during the time of Darth Tyranus' apprenticeship to himself, stored the bulk of his Sith artifact collection within a desolate structure in The Works district of the planet Coruscant, of which was also home to the secret lair of the Sith during the Clone Wars.
In the height of the galaxy-wide conflict, the rogue clone trooper Fives made an escape from the Grand Republic Medical Facility after threatening the Supreme Chancellor Sheev Palpatine's life, who was in truth the public figure of Sidious, which led to the Medical Facility's temporary closure. This securing of the facility was taken advantage of by the Sith Lord, who made way for a in the lower levels of the building, populated by his collection transferred from The Works. This move was made as a result of Sidious' fears that the Jedi Order may discover the derelict structure, along with its illicit contents, in the abandoned industrial zone.
Now forming a strong dark side reservoir, the collection sits upon walkways above a repository for large kyber crystals that await use for the contruction of Sith lightsabers in the Imperial Era. This vergence point in the Force was drawed upon for the completion of the rebirth of the fallen Jedi, Anakin Skywalker, as Darth Vader, Sith apprentice of Sidious.
As his public persona, Sheev Palpatine, Sith artifacts, including the Sith Chalice, a pair of spirit urns, and the bronzium statues of the Four Sages of Dwartii, were kept and openly displayed in the Chancellor's office during Palpatine's tenure in the Office of the Supreme Chancellor of the Galactic Republic. Even against a Sith-red colored wall as complement for the Sith-themed suite, the Jedi had yet to detect the true nature of the long-incumbent Chancellor.