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

Once a bustling cotton factory, this early 20th-century building is now home to a thriving artspace.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

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

This university transit system is a 1970s vision of the future.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

North America's largest accredited model railroad museum.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

One of the largest underground systems runs under Canada's largest urban center.

This haunting tombstone comes complete with a heartbreaking story of love and loss.

A morbid piece of memorabilia from the most famous shipwreck in current history is just one of the many poignant artifacts in this Canadian museum's collection.

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

This historic train station has been converted to a locomotive themed hotel.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The Midwestern United States' tribute to Michelangelo is a foam statue sprayed with gaudy gold paint.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The world's longest known cave system.

This stone tower in a small town's graveyard looks as though it would be more at home in a fairy tale.

This 3,500 pound obelisk was constructed with more than 1,000 reclaimed guns.

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

Enjoy egg rolls and live music in a converted bank vault.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

Dedicated to one of the darkest moments in Irish history.