A historic fort commemorating the United States' naval history.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

One of the world's earliest skyscrapers.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Abraham Lincoln's likeness rests at the top of this giant totem pole.

The empty tomb that houses the memories of Roy Bertelli's revenge.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

One of the last functioning antique elevators in Chicago.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

A Bibliophile's Dream.

This ancient Roman town was revered for the healing waters of its sacred spring.

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

To find the "unicorns of the deep" you've got to go downstairs.

These pretty kitties killed and ate as many as 135 railway workers.

The drama of nature in full effect in this Nevada State Park.

Named after an outlaw who used the basin as a hideout.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

A lovely park home with a few interesting guests.

These markers are used to document elevation changes around the famed dam.