I think that, first of all, we should visit our capital because it has many old towers, castles and churches, which you have to see.

towers 是 tower 的复数形式，tower 的意思是"塔、塔楼"，指高耸的建筑物，通常比周围建筑高很多，可以是独立的建筑，也可以是教堂、城堡等建筑的一部分。