The site of the notorious Camp Sumter Prison is now a peaceful memorial.

A historic dam made famous for its turbines and feature in a Hollywood classic.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

The secret city built by the Manhattan Project.

John Hendrix predicted the creation of the "Secret City" built as part of the Manhattan Project.

This hotel was used during the Manhattan Project to house official visitors.

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

The oldest county library in the United States.

The museum is housed inside the historic 1863 Carson City Mint.

The third-tallest lighthouse in the United States stands as a reminder of Atlantic City's early days.

One of the last mosaic tile facades found in the city.

Marine fossils from the Devonian period are exposed at this park.

A 100-foot metal tower and swinging bridge that provides stunning views of mountains in five states.

This multisensory alley has the ability to remind bustling citygoers to stop and smell the roses.

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

A collection of thousands of pieces of unique, colorful glass made in this Ohio town.

This groundbreaking 16th-century map is known as "America's birth certificate."

Deep into the lower floors of Pike Place, find a date with fowl fate.

An island graveyard with spectacular views of the Caribbean.

Believed to be the birthplace of the United States Marine Corps.

The 34th governor of Kentucky was sworn into office while on his deathbed after being shot outside the State House.

Known as the most resilient water tower in the region.