Multnomah Falls
Corbett, OR · Columbia River Gorge, OregonFree
Oregon's tallest waterfall drops 620 feet in two tiers, and the whole thing sits five minutes off Interstate 84, which is exactly why it draws two million people a year. The…

Photo: Oregon Caves National Monument (National Park Service) / CC BY 2.0
Water carved Oregon Caves through solid marble, at the end of a 20-mile road from Cave Junction. Most caves like it form in limestone or gypsum. The only way in is a ranger-led tour, run from May to the start of November. The 90-minute Discovery Cave tour climbs more than 520 steps at a steady 44 degrees, and on one 88-foot passage the ceiling drops to 45 inches. Children shorter than 42 inches can't go, even carried. Buy same-day tickets at the Illinois Valley Visitor Center in Cave Junction before you head up; the last 8 miles of the road are steep, with blind corners and deer. On summer Fridays through Sundays, the day's last tour goes by candle lantern, ten people at most.
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Lakes & rivers