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

Piled high inside this warehouse and coffee shop are salvaged goods that span every corner of the globe.

This museum is dedicated to the first coast-to-coast highway.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

The “American Gothic" artist's largest works hang in an Iowa State University library.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

A mysteriously dark cemetery monument fuels stories and legends galore.

A single artist is behind these large-scale models made of hundreds of thousands of two-inch wooden matchsticks.

Home with Gothic windows featured in a famous painting.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

This zombie-themed restaurant stands out in the heart of corn country.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

The hometown of movie legend, military officer and All-American guy next door, honors this great actor.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

Where the "World Pinball Champion” is crowned.

It would take 35 firetrucks to fill this enormous glacial pothole.

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

The ruined remains of a coal mining ghost town are hidden within the woods.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.