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When visiting Budapest: Don't go Easter weekend (and Easter Monday is a holiday there); many places are closed including churches, except for worship services. Do take a walking tour. Mine was great, we walked, peeked into private apartment courtyards, heard a great deal of history, stopped for coffee and cake at one of the many coffee shops, then took the subway back to the hotel. Don't head out on your own til you've had at least one tour.
Austria Tours & Vacation Packages | Tauck
The Rhine, Swiss Alps & Amsterdam - Northbound - Follow the romantic Rhine River on its winding journey from the Swiss Alps to the Netherlands, aboard a cruise and experience medieval winetowns, cathedrals, castles, museums, and river landscapes of the kind that inspired JMW Turner and Richard Wagner.