Katre K
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This is a must-have visit when you are in town. There are many local resources used to built this extraordinary building but also the history is quite interesting to hear. Sad to know that the cost is high but the full extent is not used. The tour gives you 7% of the whole building but still enough to see the major ballrooms and conference rooms that are unique for this building. This building offer many one of a kind and world records so highly recommend to see it with your own eyes.
We did not do any pre-work, thus we managed to book the time slot on spot, wait 2h and came back. There is a security check (no liquids, can buy after entering) into the building and then ID check once the guided tour starts. There is no possibility to wander around alone. I actually had a positive experience, especially thanks to the guide (man, under 30ties, laid back, sarcastic humour and attentive). Unfortunately cannot remember the name of the guide but highly recommend him.
For fellow pregnant ladies, we did total over 100 stairs which was not bad at all. Buy water and bring it with you of visiting on a hot summer day.