1. The Washington Monument was completed and opened to the public on September 28, 1888, after 36 years of construction. The 555-foot structure remains an iconic symbol of the city and a popular tourist attraction.

2. On September 28, 1918, the Spanish flu pandemic arrived in Washington D.C., resulting in widespread illness and death. The city quickly implemented measures to slow the spread of the virus, including closing public places and requiring the use of masks in public.

3. Civil rights activist, lawyer, and politician Charles Hamilton Houston was born on September 28, 1895, in Washington, D.C. Houston is renowned for his work in dismantling racial segregation in American schools and played a key role in the landmark Supreme Court case Brown v. Board of Education.

4. The District of Columbia home rule act, which granted limited self-government to the city and its residents, was signed into law on September 28, 1973. The act allowed for the election of a mayor and city council, and Washington D.C. became the first city in the United States to have an elected mayor and council since 1871.

5. On September 28, 2019, the Smithsonian National Museum of African American History and Culture celebrated its second anniversary. The museum, located on the National Mall, features exhibits on the history, culture, and achievements of African Americans and is one of the most popular attractions in the district.