Vienna cool Sightseeing Tour
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Hi everybody,
did anybody take part at some cool and informative City Sightseeing or kind of "Unseen historical places" walking Tour in Vienna which you could share?
I know "Hop on/ hop off" and "Red Bus City Tour" but it is not quite what I am looking for. Maybe somebody offers such king of tours for small groups?
Thank you in advance, guyz!
cheers,
Serge