This razorback ridgeline has doubled as a scenic drive since the early 1900s.

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

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

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

Over 12,500 words are scrawled across each room of this historic plantation house and no one knows why.

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

A beautiful geyser under environmental threat.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

These enigmatic ruins continue to vex archaeologists.

Elvis's own personal tropical hideaway.

Home to items never before seen by the public.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

The massive machine creates cracking displays of indoor lightning.

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

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

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!