I assume you mean monuments on Earth.
The earth rotates on its axis, and revolves around the sun, so a point on the earth will never be "pointing" at the same thing in space.
Imagine if you stood in the street and pointed at the sun, then didn't move your finger. If you stayed there all day, eventually you wouldn't be pointing at the sun at all. That is because the Earth is rotating (though to us it looks like the sun is moving across the sky).
Monuments are dead things, inert. If they remember anything, no one has ever been able to figure it out. But monuments can help humans remember the reason for the monuments.
If you buy monuments, the Borgia will never go near it again because they will fear you.
There is NONE ! But you can assume anything you wish as a reference point --- but you must realize that its arbitrary.
Is anything that takes up space
The reason is simple: the Big Bang did NOT occur in one fixed point in space. Contrary to popular presentations, the initial expansion (NOT an explosion) of our Universe was not matter filling empty space, going from an area of high density outside to an area of low density. It was an expansion of space itself, not going "into" anything. Matter was simply taken along for the ride. Every point in our Universe has had the same level of expansion as every other point.
Anything that occupies space, has mass.
Matter
There are about 100 national monuments in the United States, including:Grande Staircase - Escalante, UtahJewel Cave, South DakotaMount St Helens, WashingtonPoverty Point, LouisianaPresident Lincoln and Soldiers' Home, District of ColumbiaYou can read more and see photos of these and the other 95 monuments, below.
Ireland
The highest point of anything is called the summit.
A single location in space. Points have zero area, zero volume, zero hyper-volume, zero anything. It simply denotes a location, in a similar way that a point on a map denotes another location. A point has dimension 0.
Matter is anything having mass and occupying space (has volume).