The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

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

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

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 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

This recently restored timepiece has stood all around Kansas City.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

One of the world's most definitive collections of musical instruments, spanning all cultures and historical periods.

This massive roadside mascot was the first version of the giant to illustrate his butt.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A smoke stack so large, the Washington Monument could fit inside!

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Explore some of the most unique vehicles in history along with a cast of unsettling mannequins.

Legends surround this jagged rock formation in the New Mexico desert.

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.