Travel is the best way to challenge comfort zones. Whether that means eating a dish you’ve never tried before, experiencing different climates, cultures, and languages, or seeing your country from new angles, life is more rewarding when you traverse new territory.

We asked 1,000 travelers how adventurous they get when sightseeing, and over 44 percent responded: As long as we don’t get hurt, let’s go!

To test the limits, we’ve found nine remarkable places to seek adventure at every level—literally. From the tip-top of observation decks to subterranean caves, here are some of the best places to get views of America from new heights. And once you get enough visual inspiration, be sure to follow our Travel Sensations series to explore your other senses.

CHATTANOOGA, TENNESSEE      
Ruby Falls
An underground waterfall lit by colorful lights greets you when you journey deep below the surface of Lookout Mountain. Go for an extended tour to traverse all the wondrous cave spaces.

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Published by Expedia Viewfinder on July 18, 2018: Written by Lily Rogers