Somtimes you blow bucks and time in order to see something; then, when it's over, wind up scratching your head and asking yourself why. Sadly, I've let others drag me back to some of these darn places. Others will obviously propose additions and deletions.
(1) Stonehenge (Avebury)
(2) Any Rhine Castle (Any Welsh Castle)
(3) Eiffel Tower in daylight (Eiffel Tower at night)
(4) Dinner Cruise on Seine (BatoBus on Seine)
(5) Wax Museum Anywhere (side show at county fair anywhere)
(6) Crime/Torture Musemum Anywhere (see above)
(7) Colmar (Honfleur)
(8) Bath (Cotswalds, Warwick (town, not castle))
(9) Grimmelwald (Grindelwald -- for the gondola lift at First)
(10) Siena (Assisi)
(11) Prague (Budapest, Krakow)
(12) Eurostar (train-ferry-train or bus-ferry-bus)