After lunch at the area of Tam -Coc, which means three grottos, we went on a 45-minute bike ride through the surrounding countryside. Similar limestone formations to Ha Long Bay soared into the sky around us. At one point we parked out bikes and visited an ancient pagoda built into the mountainside. From there we took a flat-bottomed rowboat tour through the Trang An Grottoes, where “majestic lime…