Athens metro subway is rated one of the top 10. In fact, when you visit the athens metro you get to see ancient exhibitions for free. That’s because during its construction artifacts of archaeological interest were discovered and all of these are now exhibited inside the Subway (streets, houses, cemeteries, sanctuaries, public workshops, foundry pits, kilns, aqueducts, wells, cisterns, drains and sewage tunnels) .
[Learn about tickets and prices here]