This cube building, designed by Tham & Videgard Mirror, is one of the most abstract hotels in the world. The mirrors on the exterior walls make it invisible in the woods, allowing guests to be a natural part of the wildlife.
The Spaceship Tree House, Sweden
This house looks like an alien spaceship that had an emergency landing in the forest. In reality, it is one of the most innovative architectural projects of our time. This unusual building is part of the hotel complex that includes the Mirror Cube tree house.