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

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

A castle built for love, and abandoned due to heartbreak.

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

Why have you never heard of the second most popular tourist site in New York?

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

The secret city built by the Manhattan Project.

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

The land is home to swimming ponies and a legendary 18th-century treasure.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

The Hudson River School comes alive at this palatial estate.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

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

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

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

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

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