By April Rabkin
Beijing’s Forbidden City was the Chinese empire’s seat of power for 500 years. It was built out of rammed earth and wood in the early 1400s, and its majesty has been largely preserved, even though it’s now the Palace Museum and attracts as many as 130,000 tourists a day. Awkward thing about centuries-old ground, though: The sewage lines have little capacity. And 130,000 people can’t just hold it.
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