The mysterious white squirrels of this Illinois city are treated like sacred cows.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

Assemble a masterpiece at the first and only North American school exclusively dedicated to mosaic art.

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

This modest post office sits on the site of H.H. Holmes' famous murder castle.

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

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

Chicago's North Park Village was once the largest municipal sanatorium in the country.

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

What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

A science teacher's dream.

Covering 37 subterranean acres, this Armillaria gallic is a famous fungus with its own festival.

Home with Gothic windows featured in a famous painting.

A number of gruesome unsolved murders have turned this simple home into a morbid tourist trap.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

Townhouse facade doubles as an RMS Titanic Memorial.

An accidentally hidden library containing the ephemeral history of New York.

A veritable variety of odds and ends.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

A heartbreaking monument showing the last morning in the life of Jane Griffith.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

You must take the A train... to the last active cemetery in Manhattan.

A Wisconsin kitsch palace from the 1930s lives its second life in 21st-century Brooklyn.