These Postcards are from the Panama Canal Zone circa 1930-1935 according to their postmarks. We have a street scene in Cristobal
The card at the bottom depicts a piece of machinery that was used to dig the canal, reclaimed by the jungle as trees grow around and through it and it becomes part of the tree!
The card on the left is not very politically correct. Here is the text from the back of the card:"Wild Natives and Their Home, Interior of Panama. Thirty miles north of the canal, almost within sight and hearing of the industrious army busily engaged in bisecting a hemisphere for Uncle Sam, the natives are wild. As witnessed by the photograph of the young fellow taken under difficulties in the shade of the almost leafless Paupalla tree on the left, very little consideration is given to the question of clothes." I imagine you would have difficulties taking a picture if you were a white man trying to grab a young, naked black boy and hold him still for a photo!