The National Building Museum's foray into indoor golf returns for a second year on Memorial Day, and what better way than a mini-golf course to get kids (even grown-up kids) excited about a summertime trip to the museum?

How about two full mini-golf courses?

The museum's layout for 2013 has 18 holes, up from 12, and these are no ordinary windmills. D.C. design and architecture firms created obstacles drawn from a variety of influences, none of whom are named Pete Dye or Robert Trent Jones: District Design's "Ledoux for Two" hole, inspired by French Neoclassical architect Claude Nicolas Ledoux; Inscape Publico's "outSMART the GRID" hole, which simulates our electrical grid; and Design Foundry's mankind-on-the-moon-themed "The 19th Crater." (See all course designs.)

The introduction of mini-golf at the museum was a huge hit last summer. (Let's just hope there are a few more adult-sized putters available for 2013.)

The courses will remain open during museum hours through Labor Day, Sept. 2, with special late-night mini-golf nights on June 6, June 26 27, July 11, July 24, Aug. 8 and Aug. 22, when the courses will stay open until 9 p.m. It's $5 per person, per round to play. And while you're there, don't forget the barbecue.