In the pulsating heart of New York City, where towering edifices stand tall as symbols of capitalism's might, a cataclysm struck a century ago, its echoes still reverberating in the annals of American history. Wall Street, the celebrated nerve center of America's financial sector, became the scene of a horrifying disaster on September 16, 1920. As the clock struck noon, a thunderous explosion shattered the ordinary routine, leaving in its wake a trail of devastation that would etch an indelible mark on the nation's consciousness.

Just as the Financial District's lifeblood — bankers, brokers, and clerks — were flocking out for their midday break, an unassuming horse-drawn wagon, parked strategically opposite the J P Morgan bank, erupted in a fireball. The explosion transformed the bustling street into a gruesome tableau of chaos and carnage, killing 38 people instantly and leaving hundreds more injured. 

This was not merely an attack; it was a brutal statement, a violent denunciation designed to rock the foundations of American capitalism. Yet, despite its scale and the outrage it sparked, the identity of the perpetrator or perpetrators remains a mystery. No one claimed responsibility for the deadliest terrorist attack on American soil to date, one that would hold this grim record until the Oklahoma City Bombing in 1995.

As we delve into the intricate layers of this historical event, we journey back to a Wall Street that bore the scars of this brutal assault, and forward into the annals of a mystery that remains unsolved. Along the way, we will explore theories, inspect clues, dissect investigative efforts, and revisit developments that have surfaced over the course of a century.

This is the story of the 1920 Wall Street Bombing - a haunting echo from the past that reminds us of the lengths to which the unknown enemies of peace will go to spread fear and destruction. It's a tale of a city's resilience, a nation's resolve, and the unending quest for truth amidst the rubble of history. An unresolved enigma that continues to captivate and intrigue us a century later.