After a specific part of the Tower of Fantasy story, you'll unlock access to the Chronicles section in the Terminal. Inside this section, you find a Travel Log. For these Travel Log pictures, you need to find the location in-game of where the image was taken to unlock some free rewards. Here's where all the Travel Log viewpoints are in Astra in Tower of Fantasy.
All scenic viewpoint locations in Astra for the Travel Log in Tower of Fantasy
In Astra, there are five scenic viewpoints to find to complete the Travel Log for this area. For finding the location of each picture, you'll find an Investigation point shaped like an eye, which you can interact with to show essentially what the Travel Log picture shows. Once the picture is taken, head back into the Chronicles via Terminal and click on the image to earn 20 Dark Crystal and 20 Astra Exploration Points.
None of these five viewpoints are hidden, and you can find all five with relative ease just by going to the locations on the map above.
For more Tower of Fantasy guides, Pro Game Guides has you covered. Check out How does the pity system work in Tower of Fantasy? and Should you Perfect Decipher or Forced Decipher in Tower of Fantasy?