Built in 1931, this small passageway is believed to be the first modern skyway.

You can spend the night as an honorary lighthouse keeper in this quaint, historic beacon.

This old residential building was once the largest flour mill in the world.

Where the notorious gang lived while on the run from the FBI.

A statue honoring 44 continuous years of greeting passing ships.

One man's ambition created this psychedelic log home.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

New fungal and bacterial species call this deadly lake home.

A smoke stack so large, the Washington Monument could fit inside!

The home where a lovestruck Fitzgerald wrote his first published novel, "This Side of Paradise."

17,400 lbs., 12 feet in diameter, and 29 years in the making.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

The palatial McDonald's that inspired Wesley Willis.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

A gas station has taken the place of the home of the 19th American President.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

The lowest point in South Dakota and the source of the Minnesota River.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This statue is dedicated to Grace Sherwood, the last person in Virginia to be convicted of being a witch.