These 17th-century mummies are no longer naturally preserved, but remain on display today.

This ruined castle perched atop a rocky peak is a great place for a hike.

Recorded as the first person buried in Arlington Cemetery.

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.

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

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

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

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.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

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.

This statue of the "father of television" stands prominently in the United States Capitol.

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

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

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The location where the American Revolution ended.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

Walk up a ramp through a forest for panoramic views of Lake Michigan.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

This supper-club-turned-concert-venue still serves drinks at its original rotating bar.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.