A balloon at the entrance
A balloon floats over a twin-towered building on the lake, and a long causeway runs across the water.
The questionWhat do the edges of the grounds show, and what was there before 1905?
Investigate · Portland 1905
Lewis and Clark Expo Portland Oregon ballon at entrance
1 clue in this photo
Photo: International Stereograph Co., copyrighted by C.L. Wasson · Public domain · via Library of Congress via Wikimedia Commons