That night, I walked until my legs ached and my head felt pleasantly empty of everything except what was right in front of me. I wandered down to the Praça do Comércio, the large square that opened up to the Tagus River like a palm held out to the sea. Lights draped across the buildings twinkled. A large Christmas tree, all white and gold, stood sentry in the center. People took photos, laughed, sipped from cups that smelled sweet and spiced.

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