WordNet (r) 3.0 (2006):

grand tour
    n 1: an extended cultural tour of Europe taken by wealthy young
         Englishmen (especially in the 18th century) as part of
         their education
    2: a sightseeing tour of a building or institution

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "grand tour":
   aerospace medicine, aerospace research, aerospace science,
   aerospace technology, astronautics, bioastronautics, campaign,
   circuit, course, escape velocity, excursion, expedition,
   interplanetary travel, jaunt, journey, junket, outing,
   package tour, peregrination, pilgrimage, pleasure trip, progress,
   rocketry, round trip, rubberneck tour, run, safari, sally,
   science fiction, shoot, space flight, space medicine, space travel,
   space walk, stalk, step flight, tour, trek, trip, trip to Mars,
   turn, voyage