"Located on Mozambique’s southernmost beach, Kisawa Sanctuary is a collection of 17 thatched-roof bungalows built sustainably using 3-D printing technology. (The textured walls are made of sand mixed with seawater to create eco-conscious mortar.) When not snorkeling with sharks or watching sea turtles nesting in the white sand, guests can participate in scientific studies at sister center BCSS with such hands-on activities as monitoring migrating humpback whales or going on diving excursions to test water acidification levels or to help tag pelagic fish." - Kathryn Romeyn