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

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

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

This unique historical monument features large concrete spheres designed to resemble fallen stars.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

Three hundred years of preserved Spanish colonial history in San Antonio.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

Just like the real 36th president of the United States, animatronic LBJ amuses visitors with jokes and stories.

This failed condo development was reborn as a street art hub.

Once America's tallest structure, now a Baltimore landmark.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

A field of nothing but boulders which resembles a giant's gravel driveway.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

This free, take-a-book shop seems like a trick but isn't.

Eighteen miniature death-scene dioramas.

The trials and tribulations of marking Poe's grave.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A very big rock just plopped down in the New England woods.

This tiny patch of arid sand sits in one of the greenest states in the United States.

As communication goes completely wireless, this Maine museum remembers all the wires that got us to this point.