McCaig's Tower is a prominent tower on Battery Hill overlooking the town of Oban.

McCaig was an admirer of Roman and Greek architecture, and had planned for an elaborate structure, based on the Colosseum in Rome. His plans allowed for a museum and art gallery with a central tower to be incorporated. Inside the central tower he planned to commission statues of himself, his siblings and their parents. His death brought an end to construction with only the outer walls completed.

The empty shell of the tower dominates the Oban skyline, and is now a public garden with magnificent views to the islands of Kerrera, Lismore and Mull.