Nature's biggest mammal swims in landlocked Oklahoma.

This abandoned bootleg attraction was built to cash in on the popularity of classic TV show, F Troop.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

A converted hangar displays dozens of helicopters, from a famous 1943 rescue chopper to several autogyros.

This massive sycamore tree has been labeled as one of the largest in the state.

When the town wouldn't allow the fast-food behemoth to build a new restaurant, they put one inside an 1850 home.

The largest body of water in Massachusetts annihilated four small towns just to slake Boston's thirst.

A glimpse into early 19th-century education.

This former Cold War missile control site played an important role in the creation of GPS.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

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

The walls of the iconic dome are hollow and have a secret stairway.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

The tunnel under the Capitol Building where Congress takes out its trash.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

The iconic D.C. restaurant where the Cuban Missile Crisis was negotiated, now a Walgreens.

Before Nixon, "watergate" meant canals.