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

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

Perhaps the most scandalous statue of America's first president.

Largest Roman Catholic church in North America.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This titanic Catholic church in Chicago is also a refuge of the fictional cult-favorite wizard detective Harry Dresden.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

An eponymous directional signpost erected by the first president of the United States.

These unusual rooms on wheels are holdovers from the 1960s.

The naval commander’s proudest moment in battle is memorialized in this unique tomb at Arlington Cemetery.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

The romance of early commercial flight still fills this Art Deco destination.

The Kirkland Monument remembers a selfless Civil War hero who braved the battlefield to give water to his dying enemies.

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

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

A former major munitions plant that has been converted into a sprawling art space.

This pun was simply waiting to come to life, and one defense contractor made it so.

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 rogue roots are gradually consuming some of the historic marble grave markers.

At 207 feet, one of the world's longest continuous escalators.