It may not be the smallest U.S. national park (that honor goes to Pennsylvania’s Thaddeus Kosciuszko National Memorial, at 0.02 acres), but the Seattle unit of the Klondike Gold Rush National Historical Park is a small hidden gem in Pioneer Square. Interactive exhibits allow visitors of all ages to follow actual gold-rush stampeders on their cross-country adventure through journals, personal papers, and artifacts. Step into a miner’s cabin or hop on a scale to calculate your actual worth in gold. Learn about the entrepreneurs, like John Nordstrom or George Bartell, who came to the area to make their fortunes outfitting gold prospectors (and whose businesses survive today). This fascinating free museum is kid-friendly and a welcome rest stop for downtown visitors.