The world's longest known cave system.

A former 19th-century tavern, famous for its peach brandy and honey concoction.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

A son's promise to his dying father in the form of a covered bridge filled with thousands of seashells.

One of the largest wooden ships ever built is honored by a steel sculpture evoking her once-superlative scale.

The final resting place of a man who claimed that he could tame even the mightiest of bears.

The largest living museum in the Northeast recreates life from the Early Republic period complete with costumed historians and reenactors.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

Could this grave be the true resting place of legendary gunfighter "Doc" Holliday? Unclear.

Inside this small brick bungalow is a collection of toys intended for the afterlife.

Ruins of a Carnegie family mansion on Cumberland Island.

This hauntingly beautiful stretch of Florida coastline is covered in sun-bleached trees.

A life-sized baby elephant tombstone marks the grave of a circus owner at a country church in southern Georgia.

This museum honors the composer of “Swannee Ribber.”

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

Explore the dark underground corridors of this graffiti-covered former military fortification.

Five mythical trolls have taken up residence in woods and hidden on paths at the Coastal Maine Botanical Gardens.

This former hub for crafty philosophers was founded by a writer who died aboard the infamous RMS Lusitania.

A natural gas leak provides a flickering flame beneath a waterfall.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

This campus museum commemorates a national tragedy.

An elegant sandstone stairway built by the WPA still connects two neighborhoods in Akron.

But did the famous feminist and abolitionist ever really say those iconic four words?