This is the remains of the Kinzua Bridge, an old train trestle near Mount Jewett, Pennsylvania that was once the four highest in the world until it was destroyed by a rare tornado. The surviving section of the bridge was turned into a skywalk.
This is a covered bridge off of U.S. 11 south of Mount Jackson, Virginia.
This is a railroad bridge crossing the Monocacy River at the Monocacy National Battlefield in Frederick, Maryland. It was this bridge that was the main focal point of the Battle of the Monocacy. Railroads still use this bridge today.
A Norfolk Southern freight train is going across the Rockville Bridge near Harrisburg, Pennsylvania. It crosses the Susquehanna River, and it is the longest stone arch bridge in the world.
This is the Martha Mary Chapel at The Henry Ford Greenfield Village in Dearborn, Michigan. In case you are wondering, it is not named for the two women in the Bible that Jesus visited. It is named for town sisters who lived in a Michigan town.
This is a highway bridge going across the Cuyahoga Valley in Boston, Ohio as seen from the seat of the Cuyahoga Valley Scenic Railroad.
This is the Ackley Covered Bridge at The Henry Ford Greenfield Village in Dearborn, Michigan.
This is Casselmann Bridge in Grantsville, Maryland. It was once part of the National Road (present day U.S. 40). The National Road passes just south of the bridge.