This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Hidden amid a collection of trails is the site of a tragic crash.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Obscure Freemasons still live in D.C.’s largest private residence.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

This unassuming passageway played a key role in one of the most important events in U.S. history.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

The National Park Service’s best-kept secret with views that rival any in D.C.

A line of blue paint marks the route of the inaugural parade.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

D.C. once had its own tiny rival to the New York Stock Exchange.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Used as a military post in three different engagements, this fort has remained incomplete and unfired upon for nearly 200 years.

This high point in the Great Smoky Mountains is said to be home to the chief of all bears.

An ode to "The Queen of Appalachia."

This chestnut box will not be opened until the country music legend's 100th birthday in 2046.

Where you can experience the story of Appalachia, as told by Appalachians.

The remains of the iconic train crash from the movie 'The Fugitive' can still be found rusting along the Great Smoky Railroad.

In the Shawnee National Forest, amazing rock formations peer through the treeline.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Now nearly abandoned, Kaskaskia was once the capital of Illinois and one of the most important towns on the upper Mississippi.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.