Legoland, California
Credit: Kevork Djansezian / Getty Images

Legos may be a Danish invention, but the world capital of tiny plastic blocks is in Carlsbad, California, where the first American Legoland was opened in 1999. The park is younger than its continental forebears, but that actually makes it more interesting. Lego hotels and rides are the only sorts of hotels and rides that are more compelling when they're under construction than when they're actually finished. Of all the parks on this list, Legoland is the one that attracts the most childless adults, which makes sense because the appeal of a perfect fit is timeless.