In recent years, with the rise of "educational tourism," tourists looking at guidebook maps on the trail of historical monuments have all too often found that historic structures have disappeared--not just torn down, but frequently gone without a trace.
這些年盛行知性之旅，如果旅客拿著旅遊指南想要按圖索驥，恐怕只會發現歷史建築不斷消失，不但黃鶴仙去，連樓也無跡可循了。