Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

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

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

Golden plates containing what would become the Book of Mormon were believed to be buried on this New York hillside.

A field in which God and his son Jesus purportedly appeared to a young farm boy named Joseph Smith.

The press that first printed the Book of Mormon.

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.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

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

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

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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

There’s a hidden military meme engraved on the World War II Memorial.

An overlooked memorial honoring the local Washington residents who died in World War I.

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

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The wooden airship was the largest flying boat ever built.

One of the largest trees of its kind in California.