Sentence:  It celebrates the unknown architect who designed the temple of Neptune at Paestum , next to the <WSD>Parthenon</WSD> the noblest example of Grecian classic style now in existence . 
Meaning of the word marked with <WSD> tags:  the main temple of the goddess Athena; built on the acropolis in Athens more than 400 years B.C.; example of Doric architecture