America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A terrific purveyor of natural history objects and curios.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A luxuriant botanical garden below sea level.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

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

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.

A unusual sanctuary for abused and exotic animals in South Jersey.

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

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

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

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

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

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

A toxic ghost town sitting atop a massive coal fire.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The site of one of history's most indelible and horrific tragedies.

Step inside Lucy, the world's largest "elephant."

World War II bunker still standing on the New Jersey beach.