Rare recess caves fill this unbelievably beautiful Ohio park.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A circus legend leaves an unexpected endowment.

Beautiful Gothic-inspired lighthouse stands out among the run-of-the-mill striped fare on Bodies Island.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Before Nixon, "watergate" meant canals.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The national park was once a plantation estate.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

FDR's Art Deco hospital tower was hopelessly inefficient.

These unusual rooms on wheels are holdovers from the 1960s.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

No one knows how many bodies are in this vault in a Chicago public park.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

One of the largest crucifixes in the world stands 55 feet tall in a secluded, wooded area of northern Michigan.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

There's more contention than one might expect from cherry pie pans.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.