At the Bamboo Bike Studio in Brooklyn, N.Y., cycling enthusiasts can assemble their own bikes from scratch. "Everyone who leaves the studio says, 'Wow, my bike is my favorite object now,' " says bike expert and engineer Marty Odlin. Joe Zorilla hide caption

itoggle caption Joe Zorilla

The Louvre's famous pyramid turns 20 this year. When architect I.M. Pei first designed it in the 1980s, critics said tampering with the Louvre's majestic architecture was "sacrilegious." But over the years, visitors have warmed up to the giant glass structure. Sipa via AP Images hide caption

itoggle caption Sipa via AP Images