- "Wealthy, proud, and solitary, there have been Hightowers who wouldn't come down from their great lighthouse for decades. Its name, fittingly, the Hightower."
- ―Margaery Tyrell
In the books
In the A Song of Ice and Fire novels, the Hightower is described as being 800 feet tall - a hundred feet taller than the Wall itself (though still not approaching the sheer scale of the Wall, which stretches from one side of the continent to the other). It is the tallest structure in all of Westeros. It is also worth noting that the Hightower was assumed to have been built and designed by either Bran the Builder or his son, who was also named Brandon Stark.
According to The World of Ice & Fire sourcebook, the base of the Hightower, which appears to be much older than the rest of the building, is large, stout, square of fused black stone. Mystery surrounds its origins, as seamless black stone is a hallmark of Valyrian architecture, but its design is plain and unadorned (Valyrian fused stone is twisted into fanciful shapes). A link between the Hightower's base and the mazes found near Lorath has also been postulated. Whatever the case, the rest of the Hightower was built centuries later, as Oldtown developed into an increasingly important center of trade – it is after all, a lighthouse first and foremost.
Old Oak · Red Lake · Goldengrove · Bitterbridge · Tumbleton · Grassy Vale · Cider Hall · Ashford · Horn Hill · Brightwater Keep · Bandallon · Honeyholt · Oldtown (Citadel · Hightower · Starry Sept) · Uplands · Blackcrown · Three Towers · Sunflower Hall · Arbor