Top 20A salt mine worked from the Middle Ages until 1932 and turned into a spectacular underground park: a Ferris wheel, a lake with rowing boats, an amphitheatre and salt walls 120 m below ground, near Cluj.
Top 100The Unirea mine, dug between 1938 and 1970, is a string of 14 salt halls over 50 m high, 208 m underground, which you reach by minibus; 100 km from Bucharest.
Top 100A working salt mine near Râmnicu Vâlcea that you enter by bus through a tunnel: huge galleries with swirling salt walls, sports courts, an ice rink and the country's largest underground church.
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