These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

Once the most flame resistant building in the country, the South Carolina Historical Society building was almost burnt down in a fire.

The largest collection of two headed animals in the world.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Elvis's own personal tropical hideaway.

Send a postcard while vacationing with Satan.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

It's not your typical library, memorial, or book store.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This private residence was the template for one of the most beloved television homes of all time.

A massive volcanic plug is now a protected area that hosts a number of bird species.

There must be a pun in this haystack somewhere...

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A man-made island in scenic San Francisco Bay.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

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

Breathtaking and huge 430 year old maps of Italy.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A little sculpture with a large wardrobe.

Largest lake in Great Britain measured by surface area.