An obelisk commemorating Lincoln's role in connecting the coasts.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

During the 1990's nearly all of the world's LSD is thought to have come from the operators of the lab once located in this missile silo.

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

The largest tidal whirlpool in the Western Hemisphere.

A toxic ghost town sitting atop a massive coal fire.

This nine-story building can be played like an instrument.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

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

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

Even Henry David Thoreau found this glacial pothole irresistible.

An artsy hidden staircase leads to breathtaking views of San Francisco.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

A mysterious stone embedded at the base of a historic Boston building.