A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

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

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Home to items never before seen by the public.

This structure among the trees was the result of divine inspiration.

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

The first KFC is on the National Register of Historic Places.

A suspended garden, now gone, once hung in the middle of this abandoned church.

Thousands of jack o'lanterns light up Halloween at this historic West Virginia home.

A well-preserved relic of the industrial age steel and iron works that dotted West Virginia.

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

Mile-long cave system near Great Smoky Mountains.

Some North Carolina Cherokee have been keeping their history alive for decades with a single play.

The remains of this visionary community can still be found much as it was a century ago.

The largest piece of cut lead crystal adorned a grave for 75 years and is now the shining star of a glass museum.

This abandoned train tunnel has been the subject of countless ghost stories for years.

In paradise, feral pigs have claimed an island all to themselves.

Renowned restaurant tucked in a cave once occupied by buccaneers.

Beach instrument turned bed and breakfast.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

Few of the many visitors to this resort town know of its hidden Maya ruins.