Mark Hollis is up to something.

For the past week, he's been tweeting out cryptic messages about something happening in 2018. What's the answer?

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2018 will be a good year to travel with friends. — Mark Hollis (@MSUAD) January 10, 2014

2018 no passport necessary. — Mark Hollis (@MSUAD) January 12, 2014

2018 on an island? I guess I can say ..... yes. — Mark Hollis (@MSUAD) January 15, 2014

Tonight's conversation, if you want to vacation at both the Atlantic & Pacific Oceans, where do you go? — Mark Hollis (@MSUAD) January 16, 2014

Good chance it will be a little windy in 2018. Just saying ... — Mark Hollis (@MSUAD) January 16, 2014

It's hot & cold. Love all the new creative ideas. 2018 — Mark Hollis (@MSUAD) January 17, 2014

This wouldn't appear to be the basketball game in Greece.

Some ideas that have been thrown out there: Antarctica, Panama, Chicago. A U.S. territorial island? Who knows.

What do you think the answer is?

And no, I don't think the above photo is a new MSU jersey.