Sea levels are rising as arctic ice melts, so what will cities do to combat rising tides? According to architect Vincent Callebaut, they'll set sail. This week Callebaut unveiled plans for a futuristic floating village that can be 3D-printed from plastic waste. Meanwhile, the team behind the world's largest 3D printer announced plans to create a life-size replica of Syria's Palmyra arch, which was destroyed by Islamic State militants. In other architecture news, Thomas Heatherwick wants to build a tree-covered mountain in the middle of Shanghai, and a team of Harvard students built an amazing tiny home that you can rent for $99 a night.