You can have a nice walk at the town of Eleusis.
You can see some monuments quite interesting for a visitor, as
the roman thermal baths at St.Georgios square (photo I),
the remains of roman baths next to the old port (photo II),
the relics of the roman aqueduct on Demetros (Demeter) street (photo III),
St.Zacharias church, built with ancient materials and based on a Paleochristianic Basilica of 5th century (photo IV), 
and also
old industrial buildings (photo V). 

for more information: www.elefsina.gr