1. On June 21, 1783, Spanish explorers Don Francisco Saavedra de Sangronis and Don Miguel Mageo marked the first recorded landing of Europeans on Key West. They named the island "Cayo Hueso," meaning "Bone Key" in Spanish, due to the many bones of deceased Native Americans that were found there.

2. In 1948, the first regularly scheduled commercial airline flight from Miami to Buenos Aires, Argentina, took off on June 21. The flight was operated by Pan American World Airways and took approximately 20 hours, with stops in Puerto Rico, Trinidad, Brazil, and Uruguay.

3. June 21, 1964, marked the opening of Disney's "It's a Small World" attraction in Magic Kingdom at Walt Disney World Resort in Orlando. The ride features a collection of animatronic dolls dressed in traditional costumes from around the world, singing the famous song written by the Sherman Brothers.

4. On this day in 1977, the Florida Film Festival (FFF) was first held in Maitland, Florida. The FFF is now one of the longest-running and most respected film festivals in the southeastern United States, showcasing independent and international films from around the world.

5. In 2006, Tropical Storm Alberto made landfall on Florida's Gulf Coast on June 21, causing widespread flooding and damage in several counties. The storm brought heavy rainfall, with some areas receiving up to 20 inches of rain in just a few days. Despite the damage caused by the storm, there were no reported fatalities.