A turquoise lake within a volcanic crater.

The most gigantic, swoony, intimidating trio of fingers in all of antiquity.

A short nature trail winds through the greatest works of poet Robert Frost.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

An artificial crater field that trained astronauts for lunar exploration.

This massive library holds what was once the largest book collection in the world.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

The gutted remains of this Estonian mansion are a monument to a tragic love.

Rotting dome home spotted near Chapel Hill, North Carolina.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

The lost town of Neversink, sunk by New York City.

This once luxurious Catskills resort is now a haunting ruin.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

An abandoned castle owned and ignored by Masons carries a cursed history.

A classic gold rush hotel can be expected to pick up some ghosts along the way, and the Golden North is no exception.

The ruins of this Alaska gold mine form a gorgeous ghost town.

Artistic cabins actually grow deep in the Canadian wilderness.

A lake formed in the basin of a massive impact crater takes the shape of an unbroken ring when viewed from above.

A bike being "eaten" by a tree is the real Vashon legend behind popular children's book, "Red Ranger Came Calling."

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.