Q: On what would you see a 'gnomon' ?
A: sundial

Q: What is the name of the official list of books prohibited to be read by the Catholic Church?
A: index librorum prohibitorum

Q: What is an important Jewish religious site located in the Old City of Jerusalem which dates from the end of the Second Temple period, being constructed around 19 BCE by Herod the Great?
A:
wailing wall