By Brooke Porter Katz
June 13, 2014

On June 14, Philadelphia's Franklin Institute debuts the $41 million Nicholas and Athena Karabots Pavilion—the largest expansion in the science museum’s history. The centerpiece of the new 53,000-square-foot space is the permanent Your Brain exhibit; through more than 70 interactive experiences, visitors will come away with a better understanding of the body’s most complex vital organ—from learning how we react to fear to seeing how the mind can be tricked through sounds, images, and other stimuli.

Other highlights include the kinetic Shimmer Wall by artist Ned Kahn, made up of 12,500 clear anodized aluminum squares that move with the wind, and 8,000 square feet of gallery space for traveling exhibits. First up: Circus! Science Under the Big Top (through Sept. 1) and 101 Inventions That Changed the World (through Oct. 26).

Brooke Porter Katz is an Associate Editor at Travel + Leisure. Follow her on Twitter at @brookeporter1.