Located less than an hour away from Mexico City, Tepoztlan's Tubohotel is an affordable hotel that uses recycled concrete tubing for its rooms. Each tube is equipped with a queen-sized bed, with glass side that overlooks a beautiful panoramic view of the area. I know, I know. Concrete is not the most sustainable building material, but this hotel uses recycled concrete tubing for its rooms, with each room stacked in pyramids of threes.

This destination is employed by designers T3arc to build a hotel quickly and cheaply, without sacrificing the area's spectacular views. Learn more on Tubohotel.com

(images: via Treehugger)