Crossword puzzle clue "snake eye as this completed puzzle depicts"

Snake eye (as this completed puzzle depicts)

Poet whose classic work is hidden in this puzzle (see the circled squares of the completed the puzzle)

It may straddle neighboring countries ... and, in a different way, what each of four sets of puzzle circles graphically depicts

Landmark inaugurated 3/31/1889 whose shape is suggested by nine squares in this puzzle's completed grid

What each completed pair of theme answers in this puzzle is

This completed puzzle has 10 of them, each three letters long, reading diagonally

Surreptitious charge from a cell phone provider, perhaps...or what you can find seven times in this puzzle's completed grid?

Historic symbol whose shape can be found hidden in this completed puzzle