The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

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

The largest earthwork effigy in the world.

The statues honor the state transportation employees who've died while performing their work-related duties.

Perched atop a brick smokestack, this enormous lug nut symbolizes the local minor league baseball team.

The highest point in Delaware is located under a trailer so this marker across the street will have to do.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A gas station has taken the place of the home of the 19th American President.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Rare recess caves fill this unbelievably beautiful Ohio park.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

The world's longest known cave system.

The longest and widest floating bridge in the world.

The small town of Poulsbo in Washington state is the next best thing to the Kingdom of Norway.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Once a private collection, now the only museum of arms and armor in the Western Hemisphere - CLOSED.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.