Caves and nature reservesThe Buda side is the capital's green belt with popular spots for outings. Janos Hill, Szechenyi Hill, Hars Hill, Remete Hill and Harmashatar Hill are parts of the nature reserve area of Buda. Beneath the hills lie interconnected cave system. The country's third longest(7.200m) stalactite cave, Palvolgyi cave, can be seen here as well as the Szemlo Hill cave, famous for its peastone formations resembling bunches of grapes.
Ancient roman cultureThe medicinal springs were already known at the time of the Romans. Their town built in today's Obuda was for this reason called Aquincum (aqua=water). The remains of the Roman towns, military camps, baths and aqueducts can still be seen in Budapest today. In the museum in Aquincum among the ruins and remains of the civilian town a portable water organ made in 228 can be seen.