One of the oldest medical collections in Europe focusing on rare surgical instruments.

Geometry and mystery come together in an epic show of octagonal masonry.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

A dead saint, a deadly poison, and a mysterious holy ooze.

100 years later, they're still down there.

This poor little statue is the most vandalized memorial in Washington.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

A historic ruin just 20 feet away from a busy highway onramp.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A wondrous old library overlooking the nation's capital.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

The United States Capitol's former columns still stand.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

This replica stave church looks like a piece of Norway was simply plopped down in South Dakota.

One of the world's largest ice festivals dazzles visitors for over a month with radiant sculptures and carvings.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

Collection of antique science instruments displayed in recreated 1870-1930 laboratories.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.