No, the altar of incense was not located in the holy of holies. It was placed in the Holy Place, which was a separate area within the tabernacle or temple.
Solomon's Temple was the Holy of Holies.
The Ark of the Covenant was kept in the Holy of Holies.
Holy Place and Holy of Holies
The only item in the Holy of Holies was the Ark of the Covenant, containing the two Stone Tablets.
The curtain between the holy place and the holy of holies in the Tabernacle and later the Temple symbolized the separation between God and humanity due to sin. It represented the holiness of God and the limitations imposed on people in approaching Him. The tearing of this curtain at Jesus' crucifixion signifies the removal of this barrier, allowing direct access to God for all believers.
The Ark of the Covenant was kept in the Holy of Holies.
If you're using it as a noun, the plural is "holies".
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Touched by an Angel - 1994 Holy of Holies 8-1 was released on: USA: 29 September 2001
Dave browning
kodesh Hakodashim = קֹדֶשׁ הַקֳּדָשִׁים