Grotto replete with mystical designs laid out in glued shell mosaics.

This three-story antique market and curiosity emporium claims to be "the largest singly owned antique shop in the Pacific Northwest."

The world's last remaining store of its kind.

One of the few existing, fully functional Showbiz Pizza animatronic shows.

A parade of interactive nostalgia nestled within a giant brick building in downtown Hattiesburg.

The fading, forgotten remains of a once bright and booming factory.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

A rare example of an ancient Japanese hill castle believed to be the fortress of a legendary demon.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

The ruins of this medieval castle now stand as a monument against all wars.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

After years of slow decline, a derelict Gothic castle is now being restored to life.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

The beautiful baroque library of the Hapsburg empire.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

The palace of the King of Kings, burned by Alexander the Great.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

Abandoned former poorhouse, bible college, and haunted house in an Ohio hamlet.

The intriguing personal collection of a professional demon-chaser.