The standing stones at Calanais were raised in the Neolithic period on the Isle of Lewis. The wider setting includes a circle and lines of stones reaching out in several directions. Their original purpose remains uncertain.
Opened in 1890, the Forth Bridge carries trains between the shores of the Firth of Forth. Three great steel cantilever structures support the crossing, joined by lower connecting spans. Look through the triangular red lattice to the separate granite piers below. Its neighbour, the Forth Road Bridge, has a different suspension design.
The Great Hall is one of the grand royal buildings at Stirling Castle. James IV added the hall around 1503. Its golden exterior stands out from the older grey stone around it. Look for the stepped gables, tall chimneys, grouped windows and projecting round bay.
Urquhart Castle occupies a rocky promontory beside Loch Ness. Its surviving Grant Tower and surrounding ruins tell of a once substantial medieval stronghold.