Charleston, South Carolına

They call it the Holy City, for a skyline still stitched with church steeples, and it wears its charm well: pastel row houses, horse-drawn carriages, and an afternoon lifted whole from a paperback romance.

But Charleston's calm is deceptive, built rather like its houses - narrow to the street, private within. Rainbow Row's photogenic facades sit blocks from the Old Slave Mart, and the first shots of the Civil War rang out not far from where visitors now sip sweet tea on a carriage tour.

VoiceMap's self-guided audio tours don't make you choose. Walk the French Quarter with actor and guide Phil Biedron, who sets George Washington's stay beside Robert Smalls' escape from slavery, or let native Charlestonian Evans Byrd lead you along the Battery, where ironwork forged by enslaved craftsmen still holds up piazzas built to catch the summer breeze. On Meeting Street, the single house design turns whole blocks into an architecture lesson.

Plug in your earbuds, let the breeze set your pace, and hear the whole city - steeples and all.