This image shows a view of the Mackinac Bridge from a beach nearby. The people in the photo are using the public telescopes that are mounted on stands and required a small payment for a short time of viewing. These devices were common throughout the country in this era, and some still remain in various popular sightseeing locations.
The description states:
33 — MACKINAC BIRDGE AS SEEN FROM
SHORES OF LAKE MICHIGAN
MACKINAW CITY, MICHIGAN
–This image dates from the 1950s.