A derelict hunting lodge that was once the site of aristocratic debauchery.

Horse cemetery on the grounds of Blarney Castle.

An ancient neolithic tomb that only sees the sun twice a year.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

It memorializes America’s initial military response to the terrorist attacks on our country on September 11, 2001.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

"Mock all and sundry things, but leave the saints alone."

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Dedicated to a colonial woman who was hanged for being a Quaker.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

This mosaic commemorates the oldest subway tunnel and station in the United States.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

America's first public mental health facility.

This beautiful Brooklyn monument over a crypt memorializes a grim and largely unknown story from the American Revolution.

What was once a vast naval cemetery is now home to nesting birds and pollinating bees.

A small cave with a larger-than-life legend.

History says that America’s first English industrial manufacture began here with a “tryal of glasse.”

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.