Futura is a sans-serif font. It goes well with Playfair Display, Proxima Nova, Book Antiqua, Lato, Helvetica, Open Sans, Trade Gothic, Lamplighter Script, Lyon Text and GT Sectra Fine. If you're thinking about using Futura then try 18px for headers. Give 17px a shot for content.
People commonly tag it as design, sans serif, serif, modern, elegant, classy, caps, retro, conference and portfolio. You can get it from Fontdeck, Fonts.com, Fontshop, Fontspring, MyFonts and YouWorkForThem.