Visit to Gateway Arch, St. Louis, MO

Some Americans might be surprised to discover that the country’s tallest man-made monument isn’t the Statue of Liberty (305 feet) or the Washington Monument (555 feet)-it’s St. Louis’s Gateway Arch, a 630-foot wonder with vertigo-inducing views of paddle-wheel boats steaming down the Mississippi. Two tram services carry the 4 million annual visitors on four-minute rides to the top. Architecture buffs opt for the north leg, which features an exhibit on the arch’s construction, while armchair historians make for the south leg, which focuses on 19th-century life along the St. Louis waterfront. Either way, you’ll want to avoid gusty days, as the arch’s apex can sway up to 18 inches.