Omg that was one of my favorite shows
Answer:
Capri
Explanation: Natural Arch at Capri, 1871 - National Gallery of Art https://www.nga.gov › art-object-page.70987.html
I'm guessing you mean in Photoshop so you would
1. click the ruler tool
2. drag it along the line you know is straight
3. on the options bar, click straighten
hope this helps :)
Although I'm not sure, I do believe it is "Delphic Sibyl". Good luck!