You can’t miss this striking marvel smack in the centre of Athens. It is the largest temple in Greece; begun in the 6th century BC by Peisistratos, it was abandoned for lack of funds. Various other leaders had stabs at completing it, but it was left to Hadrian to complete the work in AD 131 – taking more than 700 years in total to build.
The temple is impressive for the sheer size of its 104 Corinthian columns (17m high with a base diameter of 1.7m), of which 15 remain – the fallen column was blown down in a gale in 1852. Hadrian put a colossal statue of Zeus in the cella – and in typically immodest fashion, placed an equally large one of himself next to it.