1. On July 27, 1861, the 11th Pennsylvania Infantry Regiment was mustered into service for the Union Army during the Civil War. The regiment served in several major battles including Antietam and Gettysburg.

2. In 1921, the Wolf Administration Building in Harrisburg was dedicated on July 27. The building is named after Governor George Howard Earle III's nickname "Battlefield Wolf" given in honor of his service in World War I.

3. On July 27, 1976, the Pennsylvania Turnpike Commission opened a new section of the Northeast Extension between Mahoning Valley and Lehigh Valley. The extension was designed to alleviate traffic congestion and provide easier access to the Lehigh Valley.

4. July 27, 1940, marked the opening of Hersheypark's first roller coaster, The Comet. The wooden coaster is still operational today and has become an iconic part of the amusement park.

5. In 1929, the Reading Public Museum and Art Gallery opened on July 27th in Reading, Pennsylvania. The museum is home to a wide variety of exhibits including a planetarium, a natural history collection, and several fine art galleries.