The unusual burial monument of Arizona's first governor.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

The cinder cone volcano with a less than complimentary name.

A geological mystery on Camelback Mountain.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

A mysterious "wedding cake" castle in the middle of the urban desert.

A spiritual vortex among the red rocks in Sedona.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

The headquarters of the famous Yale society.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

A formerly abandoned mental institute, now back in business.

A World War II-era submarine is stuck in the mud in New Jersey.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

On the Hudson resides one of the largest clocks in the world.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

Rusting away on the edge of New Jersey are the remains of a Cold War missile launch site.