Photo: Lee Paxton, CC BY-SA 4.0 Free walks & trails in Pittsburgh
Photo: Lee Paxton, CC BY-SA 4.0 
Photo: Jim.henderson, CC0 Allegheny Riverfront Park
Free, always
Photo: Shoham0211, CC BY-SA 4.0 Mount Washington trails
Free, always
Photo: Ainulindale, CC BY-SA 3.0 Polish Hill
Free, always
Photo: PerryPlanet, Public domain North Shore Riverfront Park
Free, always
Photo: Ainulindale, CC BY-SA 3.0 Mexican War Streets
Free, always
Photo: Morgan.rice.bassline.design, CC BY 4.0