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

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

Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

The world's longest known cave system.

Rare recess caves fill this unbelievably beautiful Ohio park.

Unique tower has outlasted a takeover of the company.

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

An ode to "The Queen of Appalachia."

The oldest covered railroad bridge still standing in the United States.

The massive Roman arch in New Hampshire that was meant to be a tomb.

A beautiful Gilded Age hotel in the White Mountains with surprising diplomatic history.

The final resting place of the first American-born professional magician.

Site of an escape, ten murders, and some scalpings.

Carved, egg-shaped stone with no explanation.

Maybe the only missile installed in a public park, this Cold War leftover was one of the first to carry a nuclear warhead.

A strange, heartwarming, decades-old declaration of love on a New Hampshire roadside.

Former abode of notable poet, complete with literary references and stories of ghosts.

A short nature trail winds through the greatest works of poet Robert Frost.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Even Henry David Thoreau found this glacial pothole irresistible.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

A quarter-scale locomotive wonderland built by one man and his family.

What was once the largest NFL stadium.

The bones of an old zoo crumbling in the shadow of a new one.