Pittsburgh, skyline, PA, Pennsylvania, Downtown skyline of Pittsburgh along the Monongahela River at sunset.

skyline, Pittsburgh, PA, Pennsylvania, Downtown skyline of Pittsburgh along the Monongahela River at sunset.

Pittsburgh, skyline, PA, aerial, Pennsylvania, downtown skyline of Pittsburgh, Monongahela River, night. Incline tracks are illuminated.

Pittsburgh, downtown skyline, Pennsylvania, A scenic aerial view of the downtown skyline of Pittsburgh from across the Monongahela River from Mount Washington in the state of Pennsylvania.

Pittsburgh, PA, Pennsylvania, downtown skyline of Pittsburgh along the Allegheny River at sunset.

Pittsburgh, skyline, PA, Pennsylvania, Aerial view of the downtown skyline of Pittsburgh and Smithfield Street Bridge (truss-type bridge) crossing the Monongahela River.

Pittsburgh, skyline, PA, Pennsylvania, Aerial view of the downtown skyline of Pittsburgh and Smithfield Street Bridge (truss-type bridge) crossing the Monongahela River.

Pittsburgh, downtown, skyline, bridge, Pennsylvania, View of the downtown skyline and 9th street Bridge in Pittsburgh along the Allegheny River in the state of Pennsylvania.

Pittsburgh, aerial, skyline, Pennsylvania, Downtown skyline of Pittsburgh illuminated at night in the state of Pennsylvania. City lights reflect in the calm waters of the Monongahela River.

Pittsburgh, skyline, Pennsylvania, A scenic view of the downtown skyline of Pittsburgh from across the Monongahela River in the state of Pennsylvania. A public train crosses a bridge over the river heading away from the city.

Pittsburgh, skyline, bridge, Pennsylvania, A view of the downtown skyline of Pittsburgh and 7th Street Bridge which crosses the Allegheny River in the state of Pennsylvania.

Pittsburgh, skyline, hot-air balloon, PA, Pennsylvania, Hot-air balloons from Three Rivers Regatta Festival hover over the downtown skyline of Pittsburgh along the Monongahela River.

Pittsburgh, aerial, skyline, sunrise, Pennsylvania, Scenic view of the skyline of Pittsburgh along the Monongahela River at sunrise in the state of Pennsylvania.