WASHINGTON — In movies and comic books, Superman could see through concrete walls, but an exhibit at the National Building Museum shows mere mortals can do it too.Called "Liquid Stone," the show ...

WASHINGTON -- It used to be only Superman who could see through concrete walls, but an exhibit at the National Building Museum shows that mere mortals can do it, too. Called "Liquid Stone," the show ...

Washington - It used to be only Superman who could see through concrete walls, but an exhibit at the National Building Museum shows mere mortals can do it too. Called Liquid Stone, the show features ...

WASHINGTON -- It used to be only Superman who could see through concrete walls, but an exhibit at the National Building Museum shows that mere mortals can do it, too. Called "Liquid Stone," the show ...

WASHINGTON - It used to be only Superman who could see through concrete walls, but an exhibit at the National Building Museum shows mere mortals can do it too. Called ''Liquid Stone,'' the show ...

BIG founder Bjarke Ingels has unveiled his Serpentine Gallery Pavilion – a wall of translucent blocks that has been "unzipped" to create a curving, cavernous interior (+ slideshow). Described by the ...