Photo: Chris6d, CC BY-SA 4.0 Free walks & trails in Baltimore
Photo: Chris6d, CC BY-SA 4.0 
Photo: Matthew Binebrink, CC BY-SA 4.0 Fells Point
Free, always
Photo: Jmj1000 (talk) (Uploads), Public domain American Visionary Art Museum exterior
Free, always
Photo: Fort McHenry Social Media Team, Public domain Fort McHenry grounds and seawall trail
Free, always
Photo: Acroterion, CC BY-SA 4.0