The Nautilus House was built in 2006 in Naucalpan (Mexico). It is a piece of bioarchitecture designed by Senosiain Arquitectos and inspired by a shell:
"The open concept inside the house is dominated by smooth surfaces, spiral stairs and natural plantings that makes the inhabitants feel like they're living inside a snail who swallowed the entire contents of somebody's back yard. While the house is surrounded on three sides by the bustling Mexico City, its West side (where most of its portal-style windows are located) has a breathtaking view of the mountains."
Check out other amazing examples of bioarchitecture here! (via)