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Every year thousands of hipsters, groupies, and die-hard fans flock to Austin for the annual South by Southwest festival, which has catapulted the Texas city up the must-visit charts for many travelers. The sandstone Capitol building is symbolic of the Lone Star State’s "bigger is better" mentality, featuring a gorgeous whispering gallery rotunda and 22 acres of grounds. Cool off with a dip in Barton Springs, a huge natural limestone pool that’s fed by underground sources.