Friction between grains of sand cause a curious "singing" sound.

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

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Prehistoric animals decorate this popular outdoor park.

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

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

A multi-storied adobe complex has been inhabited for more than a thousand years.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

When ecosystems collide in the arid Southwest.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

The highest bridge in America was built for an almost unnervingly small amount of money.

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

The Boston square dedicated to the dark poet who was born nearby.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

An eccentric inventor's castle home with its own indoor weather system.

The "Seinfeld" diner.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

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

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

Quite simply the largest tree in the world (by volume).

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The world's longest known cave system.