Answer:
amusement parks
Step-by-step explanation:
The author of the text "The Incredible Machine" mentioned that whenever they go to Coney Island, Navy Pier or the Santa Monica Pier the Ferris wheel is a must-visit place. Because of this, we can conclude that author refers to these places as amusement parks, as the amusement parks are where Ferris wheels can be found.
All of the three destinations are places on the various shores in the US, but they are all very famous exactly because of their amusement parts and Ferris wheels.
The text continues to talk of the history and present of the Ferris wheels.