These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The largest arcade museum in the world chronicles the golden age of video games which ended promptly in 1987.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

The highest point in Virginia can only be reached by passing through ponies and flowers.

Eons old volcanic activity created one of the most stunning rock formations in the United States.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

The highest point in Washington state is a volcano covered in glaciers.

The king of U.S. high points towers over every other peak on the continent.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

This historic stone bridge has an entire neighborhood clinging to its sides.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.