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

The longest living non-clonal organisms on Earth.

The largest island on the great salt lake is home to curious creatures and strange stories.

Famously misunderstood wonder of the ancient world

The first island in the world designated a light-pollution-free astronomical observation point.

An intricately decorated tiny place of worship.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

An 800-year-old island castle in Guernsey's main harbor.

These markers are used to document elevation changes around the famed dam.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Legend has it the commander of the defenders drew a fateful line in the dirt with his sword just before the final battle.

This museum explores the grim reality of life in the earliest British colonies in America.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The world's longest known cave system.

The final resting place of Harriet Tubman and other famous historical figures.

This restored house is like a time capsule of the president's unconventional inauguration.

The seat of Buffalo government is a gorgeous Art Deco palace.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

One of America's most historic homes also holds a startling literary legacy.

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

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