The fairy tale castle of the "fairy-tale king."

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

2300-year-old Roman road connecting the empire.

Breathtaking and huge 430 year old maps of Italy.

A Nesting Doll of Churches.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The site of Paul Revere's historic two lantern warning.

This landmark cemetery in Boston was created more than 300 years ago.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

Mysterious rocks that ring musically when struck.

Memorializing an American tragedy of massive proportions.

World's first "penitentiary," meant to be humane, drove men insane.

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