The US Embassy building in London is a remarkable landmark, with a design that combines utility, security, and sustainability with a striking appearance, inside and out. Opened in 2017, the building is relatively new. The design, by Philadelphia-based architecture firm Kieran Timberlake, is meant to evoke some of the foundational ideals of American government – transparency, openness, and equality. The building’s simple cube shape maximizes useable space in a high-traffic embassy, and the façade made of transparent, high-performance plastic catches the sunlight in an appealing and useful way, directing the natural light throughout the interior of the building. The outside of the building also boasts a landscaped pond that serves double duty as an attractive aesthetic feature and a rainwater retention system, reducing strain on the municipal water system and pollution of the nearby Thames River by repurposing collected water for irrigation and mechanical systems. The inside of the building is equally well designed, featuring indoor gardens and countless works of art, including an enormous mural created with the words in the US Constitution.