There are several objects located around Columbia that exist to inform the player about the history and culture of the city, as well as ways to simply see some beautiful scenic views. Each of these objects enriches the complicated story of BioShock Infinite and tells you more about its many characters.
You’ll need to find all the Kinetoscopes and Telescopes to earn the Sightseer Achievement/Trophy, and find every Voxophone to earn the Eavesdropper Achievement/Trophy. The locations of all of these objects are described in detail throughout the walkthrough of this guide!
Kinetoscopes
These inconspicuous boxes house miniature movie houses that tell you about the history of Columbia through primitive ”films”. To activate one, simply walk up to it, and press 
/
to learn more about the world of BioShock Infinite.
Telescopes
These are usually located along railings and allow you to see some of the beautiful scenery located around each area. To activate a Telescope, move up to one and press 
/ to check out an amazing view and earn progress toward the Sightseer achievement.
Voxophones
Voxophones are short voice recordings that give you additional insight into the story or point you to a secret area you might not otherwise have found. Voxophones are very important for getting the whole story of Columbia and its secrets, so try to collect all of them!