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Budapest, Hungary. Budapest, Hungary’s capital, is bisected by the River Danube, and the 19th-century Chain Bridge connects its hilly Buda district with flat Pest. A funicular runs up Castle Hill to Buda’s Old Town, where the Budapest History Museum traces life from Roman times onwards. Trinity Square is home to 13th-century Matthias Church and the turrets of the Fishermen’s Bastion, which offer sweeping views.

The Chicago River runs 156 miles through the greater Chicago area, including downtown. The river is especially known for the local custom of dyeing the water bright green for St. Patrick's Day.