Theories about the object have circulated on social media and on local news websites. The guesses include that it is a barrier, a shipwreck, a portion of an old pier, or spectator seating from when NASCAR had races on the beach. “It is a mystery,” said Tamra Malphurs, a spokeswoman for Volusia County Beach Safety.

The “unknown structure” you’re likely referring to on Daytona Beach is the mysterious concrete ruins near Sun Splash Park, often called the “Daytona Beach Ruins” or “Sun Splash Park Ruins.”

Here’s a breakdown of what it is and the theories surrounding it:

What It Looks Like

• It’s a series of large, decaying concrete pylons and platforms partially buried in the sand, exposed at low tide.
• The structure is about 100 feet long and consists of rows of pillars connected by arches, suggesting a substantial foundation.

The Leading Theory: It Was a Swimming Pool Complex

The most widely accepted explanation, supported by historical records and photographs, is that it was the foundation for the “Daytona Beach Casino and Pool,” built in the 1920s.

• History: The complex was a popular tourist destination featuring a large saltwater swimming pool, a casino, and bathhouses.
• Fate: It was severely damaged by hurricanes in the 1930s (particularly the 1935 hurricane) and was eventually demolished. The shifting sands buried the remains, which are now periodically uncovered by storms and tides.

Other Theories & Myths

Because the structure looks ancient and mysterious, several other theories have circulated: Pre-Columbian or Spanish Ruins: Some speculate it could be a much older fort or mission. However, the construction style (reinforced concrete) is distinctly early 20th-century. Bootlegger Hideout: A theory tied to Prohibition, suggesting it was used for rum-running. Old Pier or Dock Foundation: Given its location,