The Wall House in Cascais, a coastal town in an area known as the Portuguese Riviera, is an 11,840-square-foot home made with concrete, wood, and glass—and boasts a pair of large swimming pools on two levels. Designed by José Guedes Cruz, César Marques, and Marco Marinho of the Portugal-based firm Guedes Cruz Architects, The Wall House is laid out in an open-box plan, and is fitted with plenty of glass windows to enhance the synergy between its interior and exterior spaces.