The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Considered by many to be one of the most dangerous highways in Alaska.

The largest earthwork effigy in the world.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.

"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."

This impressive Boston holy house is the American mecca for Christian scientists.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

Historic Hull Street was actually the first street with a proper name in the Boston area.

This landmark cemetery in Boston was created more than 300 years ago.

The site of Paul Revere's historic two lantern warning.

Narrowest house in Boston.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

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

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

A display of magnificent stained glass windows is the first exhibit of its kind.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.