This is the monumental heart of modern Athens with a green core: parliament and its kilted guard, a shaded royal garden you can vanish into, a marble exhibition hall, and a clutch of ancient giants at the end. A walk for a warm morning, when the garden does its cooling work.
Start in Syntagma Square and climb to the Tomb of the Unknown Soldier, where the Evzones — kilts, pom-pom shoes, glacial drill — change guard on the hour below the old palace. Then step behind Parliament into the National Garden, laid out for Queen Amalia in the 1840s: palms, ponds, peacocks, Roman fragments and proper shade. Drift south and you come out at the Zappeion, its circular colonnaded court open and free to walk through.
From its forecourt, the Panathenaic Stadium gleams across the road, the all-marble horseshoe of the first modern Olympics. Finish west at the fallen columns of the Temple of Olympian Zeus and Hadrian's Arch, where an inscription still marks the old edge of the city. Akropoli on Line 2 is minutes on.