What it is
The temple stands on Jade Island and is one of the four guardian temples of ancient Thang Long, the old name of Hanoi. It honors scholars and generals, including the national hero Tran Hung Dao, and the god of literature.
The lake itself is tied to a famous legend. A giant turtle took back a king's magic sword after a victory, and Turtle Tower, further south in the lake, marks the spot. The temple connects that story to the scholars and generals linked to the victory.
What to look at
Start on the shore. The Pen Tower, a stone tower topped with a brush tip, and a gate carved with an ink slab set the scholarly tone before you even cross.
The The Huc Bridge is the photo everyone wants. Its red wooden arch looks best against morning light from the eastern shore, or reflected in still water from the temple side.
Inside, look for the glass case holding Cu Rua, the giant softshell turtle that lived in the lake until it died in 2016. It gives you a real sense of the animal's size. Then take a minute in the courtyard, where incense smoke drifts over the altars.
When to go
Early morning is the calmest time. Locals exercise and practice tai chi along the shore, and the light on the bridge is soft. Evening is also pleasant, when the lake lights come on, and the temple stays open later on weekends.
Around big public celebrations the bridge can close completely, so plan another day if a festival is on.
Combine it with nearby places
The temple fits naturally into a lake loop. Cross back over the bridge and continue south past Turtle Tower, then return along the western shore. Allow about 90 minutes with stops.
Hang Gai Street, known for silk, is about 0.2 km away. The Heritage House at 87 Ma May, a restored tube house, is about 0.5 km away. Bach Ma Temple, another guardian temple, is about 0.6 km away, and Hang Ma Street, full of paper and festive goods, is about 0.7 km away.