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

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

A massive sustainable farm designed by the mastermind behind Central Park.

This recently restored timepiece has stood all around Kansas City.

A gem in the small Missouri town where Winston Churchill coined the term "Iron Curtain" and effectively began the Cold War.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

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

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

Entombed in this strange, white stone hill are the deadly remains of radioactive weapons production.

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

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This general store is a one-stop-shop for workers at the Prudhoe Bay oil field.

The northernmost truck stop in the United States.

Impressive artifacts from Juneau's gold mining days fill this mining site-turned-museum.

One toy collector's legacy of hundreds of unique items includes the most diverse display of northern indigenous dolls.

The first Russian Orthodox church in North America and an Alaskan landmark.

One of two side-by-side totem pole parks dedicated to educating visitors on Tlingit history and culture.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

This historic collection of Native Alaskan artifacts was resurrected through a partnership between the WPA and tribal artisans.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

The king of U.S. high points towers over every other peak on the continent.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."