Never really thought about it. Have always wanted to visit either the French countryside or some picturesque forest in Europe. But someone mentioned trains and unlimited money.

A nice indulgence then would be a luxury train line that navigates throughout most regions of the planet. Probably the most expensive ever done but should be possible. Could probably take years to travel the whole planet in maximum comfort. Wonderful.

Advantages of a vacation train would also be having other people around. One cart per person/family. Not everyone would be in it for the whole ride, so probably lots of passengers changing too. Could have wonderful parties or just group entertainment like movie nights.