A priceless collection of the Nation's cryptologic history.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Evidence of a long-ago crush remains scratched into the glass at this historic Maryland House.

A sculptor's dream castle turned fantastical ruin.

Remnants of a storybook amusement park hidden behind a strip mall.

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

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

This abandoned Victorian-style house was built in 1884.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

A New Jersey state park that was once Napoleon's brother's sprawling estate.

This tiny structure was built by the creator of the Brooklyn Bridge.

The oldest observatory in West Australia.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Inside this 150-year-old barn turned antique shop is a vast array of items for curios hunters.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

A semi-scholarly approach to sex.

Explore the legends surrounding these mythical sea creatures inside this museum.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Vintage cars and motorcycles race for glory in a throwback motorsport celebration on the Jersey shore.

In the power of this waterfall, Alexander Hamilton saw the potential for industry.