Richard Meier’s love of severe geometric shapes and white spaces is hard to miss, but the rough limestone walls soften the lines and colors, offering a concession to the gently rolling landscape around the hilltop museum. Inside, billionaire J. P. Getty’s collection of paintings, sculptures, and photographs is open to the public for educational purposes. Added to this are thematic tours appropriate even for families with kids, and imaginative gardens—all of it free of charge.