As amazing as it is to get the opportunity to travel internationally, we forget about the many gems in our own backyard. Travel site TripAdvisor announced the results of its Seasonal Attractions Trend Index For Summer listing the hottest Summer attractions in the US. Overall, the main takeaway was that American travelers are "wild for the west" and are flocking to outdoor sites in that particular region of the country. See 15 of the most popular places to check out!