I don't know who constructed the obelisk because you are not asking specifically WHICH obelisk. There are many obelisks in the world to choose from.
an obelisk
One place where one can find a Twentieth Century obelisk is the Women's Monument in Bloemfontein, South Africa, which features a statue of two women with depictions of women and children in plaques on either side in honor of the many who lost their lives in concentration camps during the Boer War. Another Twentieth Century obelisk is the San Jacinto Monument in Harris County, Texas, which is topped with a star to show the importance of the location to Texan history.
The Washington Monument is a fine example of an obelisk. Just look at that obelisk!
obelisk
hexagonal obelisk
Obelisk is a noun.
Obelisk the Tormentor has 4000 ATK.
Kagul Obelisk was created in 1772.
Obelisk Press was created in 1929.
Obelisk International was created in 2006.
The Black Obelisk was created in 1956.
Dalhousie Obelisk was created in 1850.