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An obelisk is made from a solid piece of grey or pink granite.
It's like asking, "what would you like to cave on your obelisk"? There is no requirement that anything be carved on the side on an obelisk, and it would be up to the whoever made the obelisk or commissioned it as to what, if anything, would be carved on any side of it.
1850 according to Wikipedia
In ASWAN, or Ancient Egypt
The Washington Monument is a fine example of an obelisk. Just look at that obelisk!
obelisk
Obelisk is a noun.
hexagonal obelisk
Obelisk the Tormentor has 4000 ATK.
Obelisk International was created in 2006.
The Black Obelisk was created in 1956.
Obelisk Press was created in 1929.