In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

A mental health hospital dating back more than 139 years, now features a museum.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

A network of concealed passageways lies within a busy London Underground station.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.

This nostalgic blast from the grooming past is also a working barbershop.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

The great Danube river starts here.

A powerful tribute to the victims who suffered under Ethiopia's most devastating regime.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The atmospheric road was never meant to be so creepy.

A surprising museum of 20th-century technology.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.

The fountain marks the area where hundreds of accused witches were burned at the stake.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

An extensive collection of fine art devoted to man's best friend.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

A research lab and hands-on museum where visitors can experiment with retro technology.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

The last fully functional fortress of Germany's World War II Atlantikwall.

Mysterious man-made rock piles form an ancient cemetery on this rocky beach in Norway.