In 1847, Brigham Young climbed this hill to survey the Salt Lake Valley and saw a fine place to build a city.

This former wildlife sanctuary is being transformed into an art park.

This massive metal sculpture in the shape of a folded paper airplane overlooks a Utah mountain.

The last SR-71 ever constructed.

The largest island on the great salt lake is home to curious creatures and strange stories.

Largest man-made excavation on earth!

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

The "lovely red Vega" of the legendary record-settling pilot.

Art deco landmark on the outskirts of Washington, D.C.

A computer bug so primitive it was an actual insect.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

"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!”

A historic ruin just 20 feet away from a busy highway onramp.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

Where the U.S. government kept its actual treasure, before Fort Knox.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

The most accurate timepiece in the world.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

In the basement of the U.S. Capitol Building is a hidden storage room full of ornate floor tiles leftover from the 1850s.

Need a hardcopy of the 50-title Code of Federal Regulations? This is the place.