The tennis legend used this racket while breaking the race barrier and becoming the first Black man to win the US Open.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

The oldest experimental corn field in America is still creating better ways to grow crops.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

The iconic Chicago sculpture hides a beautiful and easily overlooked plaque on the backside.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

The palatial McDonald's that inspired Wesley Willis.

Nikola Tesla's former home contains an homage hidden from plain sight.

The former hotel where Tesla invented the radio.

An abandoned water sports stadium that has become a haven for graffiti and decay.

This lush Florida island is home to the ruins of a crooked ship breaker's tiny empire.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

Bat house that has only ever housed bat for one night; they all flew away and never came back.

A glimpse at Walt Disney's vision for a "community of tomorrow," in miniature.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A building so large that it has its own weather.

"We Seceded Where Others Failed."

An idyllic swimming pool tells the tale of Hemingway's trouble with women.