Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

The oddly shaped, steam-spewing building is now an art studio and gallery.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

A curious collection of oddities including a lock of Alexander Hamilton's hair and Harry Houdini's ouija board.

A Christian-themed amusement park and complex rocked by scandals.

Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

The 28,000-year-old specimen is remarkably intact.

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The school tested mustard gas for the U.S. Army during World War I.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

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

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

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