This architectural wonder of Mexico City houses several art schools and national research centers.

A century-old network of freight tunnels underneath the city's historic business district.

This 4,000-acre restored grassland in northern Illinois is home to a range of native flora and fauna, from clovers to plovers to a herd of bison.

A wondrously macabre treasury of obscure antiques and unusual oddities.

Walk along the intricate path of this stone labyrinth and gardens.

A source of civic pride, though the reason for its construction is unknown.

Twice a year, this road is closed off to allow for the migration of thousands of snakes, reptiles and amphibians between cliffs and a swamp.

This unassuming city park is home to three different types of Native American mounds.

This baseball diamond was home to the Rockford Peaches, a team featured in the hit film "A League of Their Own."

This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

This lush 12-acre site was once named the finest Japanese garden in North America.

The murals have transformed a residential alley into a vibrant drive-through gallery.

A towering Art Deco movie palace made to look like a Mayan temple.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

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

A hidden grotto on the grounds of the Kane County Government Center.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

A Japanese temple, old German townhouses, and public chess tables offer a peaceful escape from the bustle of the North Side.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

Cold War missile launch site which has been converted to a public park.

The first and only museum dedicated to stained glass and horology opened outside of Chicago in 2017.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.