Hungary
It is a simple rack and pin railway that takes you up into the Buda hills, from where you can have wonderful views over to Pest and go walking on various trails through the hills. You can also walk to the Children's Railway (a model railway entirely operated by children volunteers) from here, although we did not have time to do this I would recommend it.
It is Europe's third oldest cogwheel railway and when you go up into the snow covered hills in January its very pretty and very romantic.
It is also part of the BKV system therefore if you have day tourist travel tickets you can travel on the cogwheel railway along with the buses, trams and metro.
The lower terminus is opposite the Hotel Budapest in Buda, you can catch a tram to here from Moskva Ter and it only takes 10 minutes at most.
A real off the wall tourist attraction! A tongue in cheek art/spiritual/cultural exhibition located in an intriguing labyrinth of tunnels under castle hill. Strange music, odd statues, faux cave paintings and a real maze will keep you guessing what's round the next bend. Thoroughly enjoyable. We visited in winter when it provided much-needed relief from the subzero chill on the Hill. Drop your sulky kids off there whilst you take in the sights above ground..!
A back street on castle hill, Uri Utca 9.
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