1) In 1804, the Lewis and Clark Expedition departed from Camp Dubois, located near present-day East Dubuque, Illinois. While not in Ohio, this expedition would pass through the state on its journey to the Pacific Northwest.

2) On May 26, 1865, the Ohio General Assembly authorized the creation of the state's first public high schools. This legislation paved the way for the development of secondary education throughout the state.

3) In 1892, the John R. McLean Observatory was dedicated in Cincinnati. This observatory, funded by newspaper publisher John R. McLean, played an important role in astronomical research and education in Ohio for many years.

4) On May 26, 1937, the famous Golden Gate Exposition opened in San Francisco. While not directly related to Ohio, the Ohio State Building was one of the many structures built for the exposition, and it showcased the state's culture and achievements.

5) In 1960, the Ohio and Erie Canal Towpath Trail was officially designated a National Recreation Trail. This trail, which stretches from Cleveland to New Philadelphia, Ohio, follows the path of the historic Ohio and Erie Canal, providing scenic views and recreational opportunities for cyclists, hikers, and joggers.