On May 10, 1899, Sam wrote in a letter, "We shall reach London May 31, by way of Bremen & the steamer “Lahn” to Southampton.

David Fears wrote (for the August 3, 1899 entry) of  a letter to Rogers: "I am unspeakably sorry to lose the steam yachting and the Fairhaven visit, and I wasn’t expecting to lose the whole scheme, but the Swedish project made a sudden and radical change in our plans. You see, Jean’s health has made no real and substantial progress in the past 3 years. None whatsoever. We had tried the baths, and the doctors and everything—all no good. What should we do? For one, I was willing to try anything that might turn the tide— except Christian Science.

...

Mark Twain stayed in Vienna with his wife Olivia and his daughters Clara and Jean from the end of September 1897 till the end of May 1899, except for a few weeks in the summer of 1898, spent at the summer resort of Kaltenleutgeben near Vienna.

The family took quarters in Hotel Metropole, beautifully situated on the Franz-Joseph's Quay, on the right bank of the Danube Canal.  Later they moved to the Hotel Krantz, opposite the old Capuchin Church and Monastery, in the center of the city.

Sam’s notebook:

Sund, July 25. At 6 this am, for the first time in the week, sun & surface were just right for mirror-effects—so the lake was full of pictures.

Twain spent his time in England working on his book, Following the Equator.  Isaac Gewirtz, Mark Twain A Skeptic's Progress  pg 87-9, writes of this:

We sailed on the 15th of July in the Norman, a beautiful ship, perfectly appointed. The voyage to England occupied a short fortnight, without a stop except at Madeira. A good and restful voyage for tired people, and there were several of us. I seemed to have been lecturing a thousand years, though it was only a twelvemonth, and a considerable number of the others were Reformers who were fagged out with their five months of seclusion in the Pretoria prison.

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This was Mark Twain's second visit to the African continent. In "The Innocents Abroad" he visits North Africa.

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This is indeed India!

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After visits to Maryborough and some other Australian towns, we presently took passage for New Zeala

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Mark Twain was in Australia from September of 1895 to January of 1896.