Houses made from "freight containers".
A bar made from a hollowed out living tree.
http://www.amusingplanet.com/2011/11/sunland-baobab-bar-inside-hollowed-out.html
Sunland Baobab is a well-known enormous baobab tree in South Africa. It is one of the largest baobabs in South Africa with a circumference of 47 meter, or 33 meter, depending on who you believe, and a height reaching 19~22 meter. Regardless of the actual figure, everyone agrees that it is the widest tree on the entire continent. It is so big that there's room enough for a small pub inside. The Sunland Baobab is understandably, one of the area's most popular attractions.
Personally though, if I was a multi millionaire, I would probably choose a mini private island.
