Julius Emil Knudsen visited The Chicago World’s Fair 1893. Here’s what he wrote and some pictures of that time:

In 1893 there was the great world exhibition in Chicago … 
I had an excellent crossing across the Atlantic with the “Hapag” boat “Normannia”, which made an average of 22 knots on the voyage…
I was in New York two days before moving on to Chicago. It happened that those days there was an awful heat (104 degrees Fahrenheit) that made me suffer a lot. I then traveled to Chicago via Philadelphia and Columbus … From the head of geological surveys of the U.S.A. Dr. Davis, I received letters of recommendation to several directors for the Lake Superior pits, and then, after staying in Chicago for 14 days, I traveled to the mine areas on that lake.
 
I visited the Lake Angeline Mine (iron) where I studied the electric locomotive in the pit. From Ishpenning I traveled to Houghton, where I attended the mining academy and became familiar with the organization of the practical part of the class. From there I drove to “Red Jacket” and visited the large “Tamarac Mine”, then back to Houghton and the Atlantic Mine and its large processing plant, and finally to Tamarac’s smelter at Houghton. Then the trip went back to Chicago. I had been on this trip for a week. I stayed in Chicago for another week, where it was very interesting to see the “Mining Building” at the exhibition. The trip to New York took me via Detroit, Niagara and Syracuse, where I studied Marwin’s electric drill in “Solway Works”, a large limestone quarry, of which people expected a lot at the time, but it didn’t deliver. From Syracuse I traveled to New York via Albany.
Chicago HAYMARKET SQUARE
World’s Columbian Exposition - ELECTRICAL BUILDING
Chicago DREXEL BOULEVARD
World’s Columbian Exposition - FISHERIES AND AQUARIUMS
MADISON STREET, WEST FROM STATE
THE OFFICIAL BIRDS-EYE VIEW OF THE WORLD'S COLUMBIAN EXPOSITION
CLARK STREET, NORTH FROM JACKSON
GRAND COURT, VIEWED FROM ADMINISTRATION BUILDING World's Columbian Exposition
WASHINGTON STREET, EAST FROM LA SALLE