Punta Cruz Watchtower
... that the Punta Cruz Watchtower is the only perfect isosceles triangle tower-fort structure in the Philippines?
... that the <b id="mwAhs"><a href="./Punta_Cruz_Watchtower" id="mwAhw" rel="mw:WikiLink" title="Punta Cruz Watchtower">Punta Cruz Watchtower</a></b> is the only perfect <a href="./Isosceles_triangle" id="mwAh0" rel="mw:WikiLink" title="Isosceles triangle">isosceles triangle</a> tower-fort structure in the Philippines?