These 15 Terrifying Places in Pennsylvania Will Keep You Awake Tonight: Written by Christi Danner, from Allentown and currently lives and goes to school in Pittsburgh where she studies English Lit, writes, and sells coffee. She can be found on Twitter, @chriisti.

The 2014 Great 12-Hour Tour takes you on a day-long exploration of the city from river to river, led by experts from the Association of Philadelphia Tour Guides. (Photo by B. Krist for Visit Philadelphia)

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