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

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

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Years of archaeology, just chillin' by the water cooler.

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

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

This replica of the Greek structure is in the heart of Nashville.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

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

The yawning remains of a complex naval fortress still haunt this Australian shore.

Statue dedicated to the star of an old television show.

A place to eat for on-the-run agents and espionage enthusiasts.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

Experience a charming 1930s version of "infotainment."

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Theater has had many different incarnations but has survived the ravages of time.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

The palatial McDonald's that inspired Wesley Willis.

This historic hotel invented the chocolate brownie.

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

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.