Nothing says "summer is here" like butterflies — just the sight of them fluttering around the park is enough to send most people into paroxysms of glee. The Natural History Museum has timed its Amazing Butterflies exhibition perfectly. Even if it is snowing outside, you can walk through the museum's fabulous hatchery as hundreds of butterflies fly around your head. There's a giant maze and a zip slide, too, so you can, er… pretend you're a butterfly, apparently. Either way, you'll probably want to eat ice cream and frolic afterward.