"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.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Inside this museum resides a boot fit for a giant.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

The only Frank Lloyd Wright-designed structure in the architect's hometown.

One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

A bizarre house filled with an astounding array of collections.

This cave holds a surprisingly colorful variety of geological oddities.

A bypass decorated with large wooden troll carvings.

The mysterious white squirrels of this Illinois city are treated like sacred cows.