Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

This historic hotel invented the chocolate brownie.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

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

A Perpetually Under construction Park.

The Real LegoLand.

A fence constructed completely of skis on Monroe Street.

Chicago’s incendiary role in the labor movement.

Grand opera on a miniature scale.

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

A former atom smasher turned into an art gallery.

Museum dedicated to the art of cutting and polishing stones.

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

A collection of more than 10,000 racist objects that teaches the atrocities of social injustice and intolerance in American history.

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

More than 5,000 contemporary and "historic" mustards from around the world.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

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

The angel of death appears to weep black tears at this grave marker.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

This cave holds a surprisingly colorful variety of geological oddities.

The arboretum whose marshy soil sucked up the dreams of housing developers.