The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Two thousand artifacts from around the world collected by one woman who loved to travel.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

This dramatic rail curve was once the target of a failed Nazi attack.

A wall of chewing gum moonlights as collective art.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

The site of the climactic scene from the classic horror film is now a historic landmark.

At 207 feet, one of the world's longest continuous escalators.

This grand gothic brewery has been pumping out suds for over a hundred years.

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

The house where John Wilkes Booth conspired with his co-conspirators.

The trials and tribulations of marking Poe's grave.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

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

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

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.

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