The Smithsonian National Zoo, Washington

Smithsonian InstitutionMaryland Zoo Baltimore
Distance from Baltimore: 42 miles, about a one-hour drive Why it's worth the gas: No disrespect to the Maryland Zoo in Baltimore, which is absolutely wonderful and which you should visit regularly. (Haven't been there recently? Go ahead and check it out; we'll wait.) But the Smithsonian... T.J. Kirkpatrick, Getty Images
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