Rocks above, rocks beneath: the geologic history of Baltimore's buildings

By Ashley Sterner,

Published August 29, 2025 at 10:02 AM EDT

The Natural History Society of Maryland offers walking tours to explore the geology of Baltimore’s buildings and monuments. Some even include fossils. Photo: Melissa Gerr — The Natural History Society of Maryland offers walking tours to explore the geology of Baltimore’s buildings and monuments. Some include fossils. Photo: Melissa Gerr

Several times a year the Natural History Society of Maryland offers folks an opportunity to explore the geology of Baltimore City’s buildings and monuments. The next tour is Sunday, September 14, led by Sam Glasscock, a semi-professional geologist who volunteers for the Natural History Society — he gave us a preview.

Tags

Ashley Sterner

Ashley Sterner is the co-host of WYPR’s On The Record. With co-host Sheilah Kast, Ashley interviews artists, scientists, community leaders, and others.

See stories by Ashley Sterner

Melissa Gerr

Melissa Gerr is a Senior Producer for On the Record. She started in public media at Twin Cities Public Television in St. Paul, Minn., where she is from, and then worked as a field producer for Oregon Public Broadcasting in Portland. She made the jump to audio-lover in Baltimore as a digital media editor at Mid-Atlantic Media and Laureate Education, Inc. and as a field producer for "Out of the Blocks." Her beat is typically the off-beat with an emphasis on science, culture and things that make you say, 'Wait, what?'

See stories by Melissa Gerr