This replica of the Greek structure is in the heart of Nashville.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

An enormous, inside-out glass globe built in 1935.

Home of Howard Hughes' Spruce Goose.

The highest bridge in America was built for an almost unnervingly small amount of money.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

This hot dog-shaped diner has moved all around Colorado, but has never been to New York.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Each year, teams of the world's best snow sculptors have 65 hours to create frozen masterpieces.

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 final resting place of a 19th-century gold prospector and convicted cannibal.

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

This museum offers an actual time machine back through Colorado's past.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

"All Mountains - All The Time."

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.