In the days before HD projectors and IMAX, some of the most powerful projectors belonged to planetariums.

From banquet hall to Masonic Lodge and now concert venue, Ganz Hall is a breathtaking glimpse of into the golden age of American architecture.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

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

A little-known subterranean street runs under some of the best-known buildings in Chicago's River North.

This memorial includes fragments from one of the greatest tragedies in United States history.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This is probably not the Target you're looking for.

This remote camping site offers incredible stargazing opportunities.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

The world’s largest concentrated solar plant generates as many problems as megawatts.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

The building features one of the last remaining free-floating spiral grand staircases in the U.S.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

An off-grid art installation that encourages its visitors to imagine a world without waste.

Decommissioned experimental solar facilities that pioneered solar energy technology.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.