From the motorcycles of comic book heroes to the stranger creations on two wheels, the Harley Davidson Museum has them for the rest of the summer.

Riding enthusiasts can enjoy an exotic collection of motorcycling oddities featuring secret prototypes to fantastic folk-art creations to "What were they thinking?" contraptions. What’s being called an amazing array of treasures from the world's largest collection of Harley-Davidson materials will be on display for a limited time.

With the opening of the Harley-Davidson Museum in 2008, the general public got its first glimpse of an unrivaled collection of motorcycles and motorcycling materials. But reportedly, the museum is only able to show a small portion of this incredible collection at any one time. This summer, Collection X: Weird Wild Wonders of the Harley-Davidson Museum gives curators a chance to show a cross-section of other rare and wonderful pieces that the Harley-Davidson Archives has preserved for posterity.

The artifacts exhibited here for the first time run the gamut from experimental motorcycles that never made it to market to marketed products that seem downright odd to contemporary sensibilities. Featured displays also highlight individual creations demonstrating the ingenuity and passion of Harley enthusiasts. Some items document fascinating stories, others are completely mysterious. Together, they tell quite a tale.

Exhibit highlights include:

Vehicles - feats of engineering and ingenuity, fascinating novelties, and a variety of unique creations

Novelties - out-of-the ordinary merchandise and collectibles that highlight the broad range of both H-D branded and generally motorcycle-inspired products, from fishing lures to planters to coffee urns

Expressions of Devotion - Folk art and other individual expressions of the passion enthusiasts have for the sport of motorcycling and the Harley-Davidson brand

Amazing Assemblages - Artistic displays illuminating the variety and extent of the Harley-Davidson Archives collection

Weird Gear - Clothing and accessories from the functional to the purely fashionable

Did You Know? - objects that tell little-known stories from Harley-Davidson history, from lawnmower engines to rockets

Odd, Intriguing, and Mysterious photographs - highlights from the vast photographic archives

Decoder Activity for Kids - Kids will enjoy a special activity that will put their decoding skills to the test. Explore the exhibits and crack the secret code!

Guest Stars - a variety of strange vehicles, folk art, gear and memorabilia from other great collections.

We’re guessing its this last category the motorcycle featured in the upcoming movie ‘Captain America: The First Avenger’ could be included in.

The original ‘Captain America’ saddled up late last year on a Harley-Davidson customized to set the motorcycle in the movie timeline of World War 2. The bike was first seen last September during filming in England.

For those foggy on their comic book heroes, Captain America appeared in Marvel comics during World War 2 often depicted fighting the Axis powers. He was brought to the present day in 1964 during Marvel's 'Silver Age of Comics' with clever writing and an ice flow induced suspended animation.

The man behind the mask, Steve Rogers was a sickly young man who was enhanced to the peak of human perfection by an experimental serum in order to aid the United States war effort. Comic books being what they are, Captain America wears a costume that bears an American flag motif to fight tyranny and crime.

And the producers guiding the latest version of the famous story may be inadvertently encouraging some real life confrontations. While the America’s hero is seen on a V-Twin cruiser, some bad guys who were also photographed during the on-location filming were riding futuristic looking (for the 1940’s at least) sportbikes.

At least through the summer the Harley Davidson Museum will be displaying one of the five bikes they created for the film. Included in the display is Captain America’s leather "rescue jacket," his signature 'A' helmet, and one of the shields he carries in the film.

Displayed in The Garage on the Harley-Davidson Museum campus, the exhibit will cover approximately 8,000 square feet, and will include rare films and interactive displays.