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

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

Rising from the sea like a stone monster.

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

Famously misunderstood wonder of the ancient world

Mysterious 500-year-old tapestries depict a unicorn hunt.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

The trials and tribulations of marking Poe’s grave.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

A modernist landscape of water and sci-fi concrete.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The world's longest known cave system.

The yawning maw of this pagan visage is said to bite off the hands of liars.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

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

Sniff the Titan Arum's rotting flesh.

Home to items never before seen by the public.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The seamy, underground secrets of Portland's criminal past.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.