If you want to enjoy an amazing sightseeing tour in the historical centre of Athens and the capital's most famous ancient sights and monuments, your first choice is Athens Happy Train. The Athens Happy Train is a toy-like street train that starts its sightseeing tour from the Constitution Square (also known as "Syntagma") and follows an amazing route through the historical centre of the city, the old neighbourhoods and the hill of Acropolis.
The tour has a 40-minute duration and takes you to Athens's most famous sights and monuments including the Hellenic Parliament, the Museum of Cycladic Art, the War Museum, the Panathenaic Stadium, the Temple of Olympian Zeus, the Lantern of Diogenes, Plaka, etc.