A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

Experience a charming 1930s version of "infotainment."

See massive fossils that are over 200 million years old in northeastern Arizona.

The world's largest piece of copyrighted artwork.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

An architect's childhood fantasy treehouse made real.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

Only hotel where you can legally launder money.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

San Francisco's newly reopened hands-on science museum.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.