The coolest thing to do for $20 in every state in the US

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A few years ago, $20 seemed like a lot of money. However, these days, $20 can feel like nothing at all. You might spend $20 on your monthly gym membership or a movie ticket, sans popcorn.

Luckily, there are still some things to do in the U.S. for $20 or less; you just need to know where to go. Here is a look at some of the coolest things to do on a budget in all 50 states.

Alabama: Birmingham Barons

Price: $14
Location: Birmingham

Attending a minor league baseball game is one of the best things to do when you want to save money and see professional-level athletes. The Birmingham Barons is the minor league affiliate of the Chicago White Sox, and for just $14, you can see the team in person. Attend on 50-Cent Hot Dog Night, held every Tuesday during the season, and get a great deal on dinner, as well.

Alaska: Aurora Borealis

Price: Free
Location: Fairbanks offers some of the best views.

The best thing about the aurora borealis is that you don't have to do much to experience it. Look to the night sky around the equinoxes, ideally seven days before and after a new moon, to see this breathtaking natural phenomenon free of charge.

Arizona: Biosphere 2

Price: $20 for an adult ticket
Location: Tucson

The Grand Canyon is great, but one of the coolest things to do in Arizona for $20 is visit Biosphere 2. Housing multiple artificial ecosystems, Biosphere 2 conducts state-of-the-art research into topics as diverse as growing food on Mars and the effects of drought on the rainforest.