Each Panorama is a complete circle of visual information. Everything you can see standing in one place and looking up and down and all around in front and behind your position. Due to this fact whatever is behind you being brought around and to be viewed in front of you requires some substantial amount of distortion. This is the same type of projection map makers use to illustrate the world map with lots of exaggerated perspective at the poles..
Changing the position of the poles (north and south poles, or the Zeinith and Nadir point) means the perspective is even more unusual and lines are seldom straight.
Panoramas of the bridges with an apparent angle of view where the viewer is on the ground looking UP, or elevated and looking down. Either way, there is a 360° view in a circle and 180° from the center of the circle towards the edge where the outside edge of the circle is the antipodal ( the opposite pole) to the center.
The Squam Bridge in Ashland #65 on the state's list. Find more information on the squam bridge here: http://www.nh.gov/nhdhr/bridges/p109.html
The Campton Blair Bridge off exit 27 is state bridge #41. You can find more information on the Campton Blair Bridge here: http://www.nh.gov/nhdhr/bridges/p77.html