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!

The world’s first penitentiary, meant to be humane, drove men insane.

The giant squid's 27-foot-long corpse lies preserved within a Sarasota aquarium.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

A circus legend leaves an unexpected endowment.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

This steamer is known as "The ship that built Cleveland."

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.