On the north slope of the Spis Castle is a geoglyph of a stylized Celtic horse from the coin found in the Spis Castle. The geoglyph is a picture or a pictograph on land depicting a figure or an ornament. It is a structure of an enormous size. Andrew Roger, the author of this geoglyph, is an Australian artist and sculptor who implements geoglyphs of the present time all over the world. The geoglyph next to the Spis Castle was his first European piece of work. It was implemented as a part of a Rhythm of Life series. Being 100 m wide and 70 m long, this geoglyph was put together from loosely placed travertine boulders. 3000 tones of travertine were used; the construction took two weeks and approximately 140 workers worked on it. The total value of the travertine used for the construction of the Celtic Horse reached 330 000 €.