This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

A monument in a town outside of Boston celebrates the visits of Edgar Allan Poe.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

This Massachusetts home was the first to have a telephone line and its own phone number: 1.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

One of the largest public collection of historic armored and military vehicles in North America.

The ceiling of this vintage movie palace is covered in fantastic Art Deco murals.

This delicate museum is devoted to the art and industry that once supported Cape Cod's oldest town.

Massachusetts memorial to murder victim Elizabeth Short near the spot where she was born.

35,000 grape hyacinths flow like water down a garden hill.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

This sublime architectural marvel is a rare example of an expressionist church.

Old Danish castle immortalized in Shakespeare's Hamlet.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

This small red school was where Germany signed their surrender during WWII.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Commemorating a unique medieval profession: men who collected feces.

A tilted half-timbered house from 1672 is built into a salvaged segment of a medieval wall.