1) Certain monuments 2) Karnak Temple sights 3) Stone pillars 4) Tall, tapering pillars 5) Tall, tapering stone pillars 6) Tapering pillars 7) Tapering stone pillars Found on https://www.crosswordclues.com/clue/obelisks
tall, square sided pillars which taper to a point, erected for commemorative or memorial reasons, sometimes quite trivial such as the death of a dog or horse. (Illustration) - Wade Bridge at Aberfeldy (detail). Found on http://www.encyclo.co.uk/local/20935