Take a drunken tour inside the world's largest known geode.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

For decades, this waterfall remained hidden because of an artificial dam.

One man's ambition created this psychedelic log home.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

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

Years of archaeology, just chillin' by the water cooler.

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

Ghost stories surrounded this “castle,” the only structure from a huge mansion that was never built.

The first declared National Monument in the United States.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

This steamer is known as "The ship that built Cleveland."

To find the "unicorns of the deep" you've got to go downstairs.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

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

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The 28,000-year-old specimen is remarkably intact.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.