Drummond Castle is situated near the town of Crieff, in Perthshire, Scotland.

The castle was built originally by Sir John Drummond in 1491 and the grounds, famous for its magnificent formal Italianate parterre garden, were laid out by another John Drummond, 2nd Earl of Perth, in the 1630s.

The centrepiece of the parterre is an amazing sundial, in the form of an obelisk, a type of sundial found uniquely in Scotland.

The sundial was carved by John Mylne of Perth, Master Mason to King Charles I.

An obelisk dial, such as this, often has a square shaft with four panels,each with sunken dials. Next is an octagonal boss with the upper and lower edges sloped off to form a total of 24 individual dials.

Finally on top, seven more tapering carved stones, each with eight panels incorporating more dials. There are as many as seventy obelisk dials in Scotland but this apparently is the oldest to be dated with certainty.