Mount Breckan is a grand 38-room residence, originally located on 160 acres in the south-coast town of Victor Harbor, South Australia. It was designed by William McMinn in a Gothic Revival style, and completed in 1881.
The house was one of the largest residences in Australia at that time, with a floor area of 19,000 square feet, sixty rooms, two cellars and a five-storey tower. It was commissioned by Alexander Hay, a prominent politician, farmer, and wealthy Rundle Street merchant, and cost ₤25,000 to build. It was originally used as a summer retreat. Hay died in 1898. In 1908 the house was destroyed by fire; due to inadequate insurance coverage, the Hay family did not rebuild the ruin. The following year Hay's widow and a daughter were lost on the ill-fated SS Waratah.