An eight-arch railway viaduct, spanning three roads and a river on the boundary between North Lanarkshire and Falkirk Council Areas, the Castlecary Viaduct opened in 1842 to carry the Glasgow-Edinburgh Line. It is located a quarter-mile (0.4 km) south of the Forth and Clyde Canal and a similar distance northeast of Castlecary. Also known as the Red Burn Viaduct, this masonry structure was the work of Thomas Grainger (1794 - 1852) and John Miller (1805-83) and still carries the Glasgow-Edinburgh Line. It is 177.8m (583 feet) in length, with each span reaching 15.2m (50 feet), and rises to 26.9m (88 feet) in height. It spans the B816 road, the M80 motorway and an unclassified road, as well as the Red Burn. It also lies next to the line of the Antonine Wall.
Similar to, but much shorter than, the A-listed the Avon Viaduct, the Castlecary Viaduct was B-listed in 1972.