Yep. It was in Inverness. That's where the murder of Duncan takes place.
Macbeth was a historical figure from 11th-century Scotland and was a king, but it is unclear if he owned a specific castle. In William Shakespeare's play "Macbeth," the character Macbeth is depicted as residing in a castle in Scotland, although the play is a work of fiction.
Macbeth kills Duncan in his own castle at night time.
The soldiers are on night watch at the castle in the opening of the play "Macbeth." They are accompanied by Banquo and Macbeth.
b/c King Duncan is remarking how lovely refreshing and full of life MacBeth's castle is. In fact, it is a place where his own murder has been planned and agreed upon; it is, in fact,a place that is dark with evil. And in a few hours he will be asleep and stabbed in night's darkness.
There are a number of castles in the play: Forres, Inverness, Fife and Dunsinane. Inverness is actually Macbeth's castle.
Macbeth's castle
In Act 1 they are living in Inverness, possibly in a castle or possibly in a large house. By Act 5 they are living at Dunsinane, which is a castle.
Macbeth's coronation
Glamis Castle.
Malcolm and Siward are able to easily enter Macbeth's castle because they have an army with them that outnumber Macbeth's forces. Macbeth's attention is divided as he is also dealing with the internal conflict and being overpowered by external threats, making it easier for his enemies to breach the defenses. Additionally, some of Macbeth's own men may have sided with the approaching army, allowing them to gain access more easily.
Macbeth brings back King Duncan's bloody daggers to the castle after he murders him.
MacDuff and Lennox knocked at the main entrance of Macbeth's castle to gain entry.
Banquo describes Macbeth's castle as being in a pleasant location and soothing.