To see ancient Roman ruins and relics, you only have to catch the HÉV train from Batthyány tér towards Óbuda and find Aquincum, an area dedicated to the memory of an era when it belonged to the Roman Empire after 100AD. The Roman soldiers and citizens left behind archaeological remains enough to fill a whole museum. Some of these artefacts were discovered during the renovation works after World War II and thereafter. If you walk through the underpass at Flórián tér, you should also see underground ruins and, at street level, you can find what’s left of an ancient market, the Mithras sanctuary, the Roman bath and a forum, near the Aquincum Museum.