The "world’s largest honky-tonk" also has its own indoor rodeo arena.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A computer bug so primitive it was an actual insect.

A Circus legend leaves an unexpected endowment.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

Largest Roman Catholic church in North America.

The only diamond mine in the world where you can keep what you find.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Where manatees are the snowbird vacationers in these balmy Florida springs.

A modernist landscape of water and sci-fi concrete.

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

A bit of retro transportation flair preserved in the world's largest department store.

A celebration of capitalism in Midtown.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Washington's iconic carousel has a nice piece of Civil Rights history.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The "lovely red Vega" of the legendary record-settling pilot.

A super-sized promotional trick that is now a D.C. landmark.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The house where John Wilkes Booth conspired with his co-conspirators.