This rugged area of red rocks and arches is often considered one of the most beautiful places 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."

Yale University's home for rare works, including the mysterious Voynich Manuscript.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

The oldest working mechanical clock in the world.

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

The most loyal of little dogs, or a Victorian era publicity stunt?

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

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The first declared National Monument in the United States.

Towering basalt columns, a creation of fire and ice.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Hear the quietest sound from across the dome.

Famously misunderstood wonder of the ancient world

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.