Tour Description Baltimore’s story begins long before the first ships entered its harbor. This unique private journey explores the remarkable geology that shaped one of America’s oldest and most important cities, revealing how ancient mountains, rivers, coastlines, and bedrock influenced everything from settlement and transportation to architecture and industry. Depending on your interests, the itinerary may examine the Piedmont, Coastal Plain, the Fall Line, serpentinite, marble, the ubiquitous - and eponymous - Baltimore Gneiss!