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

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

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

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

Enchanting gardens surround a derelict mansion, all hidden in plain sight behind a stone wall.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.