Vancouver sits on the Columbia River in southwest Washington, across the water from Portland, Oregon. Fort Vancouver National Historic Site preserves a fur trading post built in the 1800s, with a reconstructed fort, gardens, and officers' homes along Officers Row. Esther Short Park, the city's oldest public square, hosts a farmers market and summer concerts near downtown. The Columbia River waterfront offers paths, restaurants, and views of the river traffic, and Pearson Field, one of the oldest operating airfields in the country, sits beside the fort grounds.