Clues: [contextual images] Instructions: Name That Landmark
_ _ _ N _ _ _ _ _ _ _ _ _
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The landmark you are looking for is
The grid is actually
The planets of the solar system represented using chemical elements. The first is a bit of wordplay with using the element Mercury - Hg, while the rest are made up as follows, removing letters where necessary:
And as you can see, following the arrows spells out 'VESUVIUS' - the name of the landmark we are after!
OP Edit - Additionally, the chemical number for Mercury is 80. the phrase "80-1=explosion" is meant to point to the year 79AD when Vesuvius erupted. Furthermore, during the time period of 79AD, the only known planets were Mercury, Venus, Earth, Mars, Jupiter, and Saturn.