Approximately 300 million years ago, a massive coral reef existed in what is now the largest limestone cave in Japan.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

A lighthouse built to save lives that took quite a few with its treacherous location.

One of the few places where inexperienced snorkelers can spot a shark.

This naturally-sourced hot spring is now home to a clothing-optional resort.

This mural celebrates the early integration of a New Hampshire baseball team.

A stretch of New Hampshire lake water is the only ice runway in the lower 48 states that is FAA-approved.

This smiling statue memorializes local cartoonist Bob Montana and his legendary creation.

The dress young Pierce wore prior to his breeching ceremony in the early 1800s is now on display for all to see.

A serene plaza that commemorates one of the Granite State's most iconic figures.

This small, unassuming, nursery plays hosts to some unique plant life.

A small obelisk marks the spot where Captain Sam Greele was killed by a falling tree.

A man killed in a hunting accident is eternally guarded by a granite hound tombstone.

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

An unrecognized nation-state created in the 1820s to avoid taxes.

One of 100 “Whaling Wall" murals painted in 13 different countries by a renowned marine life artist.

A gravestone marks where a man's lost limb was laid to rest.

This New England drive-in was built to straddle the border between two states.

3,200-square-foot mural inside Dartmouth Library depicts the history of America with images of human sacrifice, ancient gods, and other unspeakable terrors.

The gravestones in this historic cemetery are carved with mysterious faces.

This modern medieval weapon of war was built to toss pumpkins.

Final resting places of a husband and wife who became famous for their claims of extraterrestrial abduction.

A 12,000-year-old bog boasting rare plants and fauna.

The only one of New Hampshire's original 14 World War II watchtowers to survive in near-original condition.