Dublin's "Dead Zoo" serves as a window to Victorian museum design.

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

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

This bell is one of the last remnants of the lost city of Triadelphia.

Hear, smell, see, taste, and touch history at this immersive Civil War hospital.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

This monument traces the segregation line that inspired the first rural branch of the NAACP.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

Brain collection and database that narrows the gap between man and animal.

The headquarters of the Audubon Naturalist Society is a small slice of heaven for nature lovers.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

This one-room doctor's office has been moved twice, and now lives on as a museum.

In 1889, a small group of women began meeting to discuss literature, art, and other topics. Their every-other-week salon grew into a lending library that still exists today.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

Once damaged by Hurricane Agnes, this bridge is now on the National Register of Historic Places.

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

This abandoned Victorian-style house was built in 1884.

Unannounced visitors are now welcome at the site of the largest Prohibition-era bootlegging operation in the region.