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

Stumps of an Ice Age forest, visible only at low tide.

Friction between grains of sand cause a curious "singing" sound.

This picturesque abandoned home is rumored to be a spite house.

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The remains of the dam that unleashed a 15-foot wall of water on Denver.

A brick-paved former section of the historic coast-to-coast highway.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

The largest source of fossilized insects anywhere.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

One of the largest pieces of scientific equipment ever carried on a NASA space shuttle sits in a Chicago alley.

The final resting place of the world's first nuclear reactor.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Palatial mansion estate used in films including "Flowers in the Attic" and "The Witches of Eastwick."

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.