Illinois is full of natural wonders and prehistoric monuments, some of the most fascinating examples are found in our caves and mounds.

Head down to Cave-In-Rock State Park in southern Illinois, where a massive riverside cave carved into the limestone cliffs has captivated visitors for centuries. Once rumored to be a hideout for river pirates, but don’t let that dissuade you from visiting, this site now offers a scenic and safe peek into the state’s rugged past.

A bit farther north, Illinois Caverns State Natural Area near Waterloo is one of the few public wild caves in the Midwest. With its underground streams, mineral formations and cool year-round temps, it’s a true adventure for nature lovers and geology buffs alike.

Above ground, Illinois is home to some of the most important Native American archaeological sites in the country. At Cahokia Mounds, just outside of St. Louis, you’ll find the remnants of a massive city that once rivaled London in size. It’s a powerful reminder of the Mississippian culture that thrived here long before European settlers arrived.

For a more intimate experience, Dickson Mounds offers insight into Native life along the Illinois River. Its museum and trails overlook the valley, once home to generations of Indigenous communities.

From underground to prehistorical heights, these sites offer an immersive way to connect with Illinois's natural and cultural history.

Although historic accounts regarding the origins of deep dish pizza differ, the consensus holds that the birthplace of deep dish pizza was in Illinois. Chicago, now home to iconic chains and local restaurants, is where deep dish was invented at Pizzeria Uno on 29 East Ohio Street.

Since its invention in 1943, deep dish pizza has gone through numerous iterations throughout the years, becoming a staple across the city and beyond with restaurants dedicated to the Chicago-style pizza across the country.

Spring is finally here and we have much to celebrate, including these notable figures born in Illinois this month! They say a state’s greatest pride is its people – and Illinois certainly has much to boast about. Here are this month’s birthdays:

March 21 is recognized as World Poetry Day, and to celebrate we are highlighting a Pulitzer Prize winning poet, Gwendolyn Brooks!

Gwendolyn was raised on the South Side of Chicago, where she began writing from a very young age with her mother’s encouragement. In her teen years, she began submitting her poems to various publications, and later became a regular contributor to “The Chicago Defender” by the time she had graduated from high school. Her poems often ranged in style from ballads and sonnets to using free verse, and drew upon experiences of living in the inner-city.

Every March, Chicago transforms into a sea of green—but nothing captures the city’s St. Patrick’s Day spirit quite like the tradition of dyeing the Chicago River green. This iconic celebration dates back to 1962, when city officials first poured dye into the river to detect illegal sewage leaks. The vibrant green color was such a hit that it quickly became a beloved annual tradition.

Led by the Chicago Journeymen Plumbers Local 130, this unique event kicks off St. Patrick’s Day festivities in true Chicago style. Using an environmentally safe orange powder (yes orange!), the river magically turns a shade of green that lasts for hours.

The tradition has become a symbol of Chicago’s rich Irish heritage and festive spirit, drawing crowds from around the world. Alongside the famous St. Patrick’s Day Parade, the green river is a must-see spectacle that reflects the city’s pride, community and love for celebration.

As the river glows green, Chicagoans and visitors gather to honor tradition, share in the joy and celebrate what makes this city unique.