1. In 1804, the District of Columbia saw its first recorded bankruptcy case when a merchant named Lemay filed for bankruptcy. This was a significant event as bankruptcy law was relatively new at the time, with a federal bankruptcy law only being passed in 1800.

2. On March 26, 1865, the United States Congress passed a bill to create a Washington Monument Association to oversee the completion of the Washington Monument. The monument had been under construction for over 30 years at this point, but various setbacks had caused delays.

3. The first Cherry Blossom Festival in Washington, D.C. was held on March 26, 1934. This festival has since become an annual event, and thousands of visitors come to the city each year to witness the blooming of the cherry blossom trees.

4. In 1968, on March 26th, Washington, D.C. experienced significant civil unrest following the assassination of civil rights leader Martin Luther King Jr. Riots erupted in various neighborhoods, leaving many businesses and homes destroyed.

5. March 26, 2010, marked the opening of the National Museum of Crime and Punishment in Washington, D.C. The museum is dedicated to exploring the history of crime and punishment in the United States and features exhibits on infamous criminals, police investigations, and modern-day forensic science.