The day a deadly wave of molasses hit Boston

A 2.3 million gallon wave of molasses rushed through Boston streets at 35 miles per hour.

The tank was poorly constructed and leaked so badly that workers painted it brown to hide it.

Rescuers used saltwater to break down the sticky syrup during the difficult cleanup process.

Residents claimed the North End smelled like molasses on hot summer days for decades afterward.

The disaster killed 21 people and injured 150 others.