Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

More than five miles of underground passageways.

Follow the steps, and this roadside artwork will teach you how to dance.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This park contains one of the largest concentrations of cedar glades, a unique and rare ecosystem.

A white oak with property rights.

This titanic Catholic church in Chicago is also a refuge of the fictional cult-favorite wizard detective Harry Dresden.

This shop for all your super spy needs hides an educational secret.

The beloved home to all publications indie, erotic, and punky.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

A Bibliophile's Dream.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

Legend says Dungeons and Dragons players can get their dice blessed at the creator of the game's memorial.

Every winter, the wind carves blocks of frozen water into beautiful abstract shapes inside this unusually curved tunnel.

Despite its name, this fast food museum is actually a replica of the ninth McDonald's store.

A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

This family driveway also serves as the highest point in Illinois.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

Today this bizarre rooftop phone booth seems like a piece of kitsch but it was once used to spot disastrous storms.

The carved remains of a 200-year-old oak tree memorialize the namesake of the iconic "Wizard of Oz" character.

A dilapidated dock tells the story of Titanic's missed arrival.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

Japanese island famous for poison gas and fluffy bunnies.