There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

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

This single room has survived the centuries with almost no deterioration.

The topiary maze at the Habsburg hunting lodge.

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

The ancient tomb acts as a calendar that keeps perfect time.

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

At 207 feet, one of the world's longest continuous escalators.

The "lovely red Vega" of the legendary record-settling pilot.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

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.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

The world's largest piece of copyrighted artwork.

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

Cold war icon and onetime "hole" in the iron curtain.

250-year-old farm now features sculptures, a petting zoo and a hippy-bazaar.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

Abandoned Coast Artillery fort now serves as a graffiti canvas and sightseeing vantage point.

The final resting place of New England's last "vampire."