The last masonry skyscraper ever built reveals a transitional moment in architectural history.

A former atom smasher turned into an art gallery.

World's second largest particle accelerator, where nature reveals its secrets.

Eclectic collection of rare and beautiful stones in a historic home.

A six-story-tall golden pyramid, surrounded by a moat.

The final resting place of the world's first nuclear reactor.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

What may be America's largest classic video game arcade lurks inconspicuously in a Chicago suburb.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

A hot dog stand where the heads are just as hot as the dogs.

Shop of curiosities with a dinosaur museum tucked in its basement.

A science teacher's dream.

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

The subtle science of a master molecular gastronomist.

A Bibliophile's Dream.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

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

A lush green oasis in the middle of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

A private home collection of more than 3,500 cat figurines.

One extremely determined man's homemade universe.

A collection of 1,300 accordions of all shapes and sizes displayed in chronological order.

One of the last surviving C-97s sits in a field in front of a Wisconsin inn.