Are you looking for fun and FREE ways to keep yourself and/or the kids entertained this summer? Believe it or not, you don't have to pay a lot in order to have an unforgettable day, as demonstrated by these 8 fantastic (and -- once again -- FREE) factory tours that you can only take in Denver:

1.) The Leanin’ Tree Museum and Sculpture Garden (Boulder)

Have you ever wondered how greeting cards are made? The answer lies within the Leanin’ Tree Museum and Sculpture Garden, which features both the private art collection of the Leanin' Tree's founder, as well as the printing press, cutting machines, and other instruments that produce their beloved greeting cards.

2.) Colorado State Capitol (Denver)

A true Denver rite of passage is taking a tour of the extravagant Colorado State Capitol! As if the exquisite touches like Colorado rose onyx and 24-karat gold weren't reason enough to visit, a tour of the Capitol also features exhibit areas and a chance to walk the stairs to the infamous "One Mile Above Sea Level" marker.

3.) Coors Brewing Company (Golden)

Contrary to popular belief, there is no need to leave the kids at home when you tour the famous Coors Brewery... they just can't partake in the free samples after the 30-minute tour!

4.) Great Divide Brewing Company (Denver)

What? You didn't think the hoppy fun ended in Golden, did you? "Daily tours take you behind-the-scenes of our new facility and outline the plans for the new brewery, beer garden, restaurant, and Tap Room that will fill up the rest of our new 5 acre space in the next few years." I'll drink to that!

5.) Celestial Seasonings (Boulder)

If brews aren't your drink of choice in terms of unwinding, we are willing to bet that an herbal tea is more your thing (and that Celestial Seasonings is your place)! From the manufacturing and packaging center to the infamous Mint Room to the delicious Celestial Café, there is no shortage of things to love on your tour of the Celestial Seasonings Tea Factory.

6.) Hammond's Candies (Denver)

What is better than touring a candy factory and seeing how your favorite sweets are made? Touring a candy factory, seeing how your favorite sweets are made, AND getting a free sample of one of Hammond's famous treats!

7.) Bookcliff Vineyards (Boulder)

Located in the back of BookCliff's delicious tasting room lies the crown jewels of their business: the fermentation tanks and aging barrels! See for yourself how/where your favorite wines are made -- and sample some of the fare -- at Boulder's BookCliff Vineyards.

8.) United States Mint (Denver)

You see and use it on a near-daily basis, but did you know that the cash in your wallet just may have been produced right here in Denver? See how money is made on this fascinating and educational tour! (Unlike the other tours, the Denver Mint does not offer free samples... sorry.)

For even more free things to do around the city, check out these 13 Legitimately Fun Things You Can Do In Denver Without Spending A Dime!