Another comment in this thread has a link to a source confirming the die is real, doesn't mention the pillar tho

Akshually https://en.wikipedia.org/wiki/List_of_peaks_named_Olympus several are in turkey as well.

Nah uhh i watched Percy Jackson and the Olympians and Olympos is in America.

Seriously though I keep getting pulled out of the show because it's so American when it's Greek mythology.