Just off the lakeside square dedicated to the statue of Emperor Lý Thái Tổ stands a worn-out monument colloquially known as the Frog Garden Fountain. It’s a rectangular stone pillar standing on a pool decorated with sculptures of frogs and dragons, unassuming but somewhat whimsical. It appears to be of no particular note at a glance, but it hides a little secret from the French Colonial era. Installed in 1901, the fountain is the oldest surviving one in the city. It is the centerpiece of the surrounding Diên Hồng Flower Garden, a…