Synonyms to observation tower

cupola, antenna tower, apse, arcade, arcature, arch, arched roof, archway, barbican, belfry, bell tower, camber, campanile, ceilinged roof, colossus, column, concameration, concha, cove, derrick, dome, fire tower, geodesic dome, igloo, keystone, lantern, lighthouse, martello, martello tower, mast, minaret, monument, obelisk, ogive, pagoda, pilaster, pillar, pinnacle, pole, pylon, pyramid, shaft, skewback, skyscraper, span, spire, standpipe, steeple, stupa, television mast, tope, tour, tower, turret, vault, vaulting, voussoir, water tower, windmill tower, abatis, advanced work, balistraria, bank, banquette, barbed-wire entanglement, barricade, barrier, bartizan, bastion, battlement, breastwork, bulwark, casemate, cheval-de-frise, circumvallation, contravallation, counterscarp, curtain, demibastion, dike, drawbridge, earthwork, enclosure, entanglement, escarp, escarpment, fence, fieldwork, fortalice, fortification, glacis, loophole, lunette, machicolation, mantelet, marte