Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

This former sugarcane transport tunnel is now a portal to a lovely beach.

One of the most remarkable caves in all of Iceland was created by a once raging river of lava.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

This beautiful, historic church looks like something out of a simpler past.

This hobbit-y little hot spring may be the oldest spring used by humans in all of Iceland.

This elegant arc of a waterfall marks a religious turning point.

The oldest church in Iceland is one of the few to feature ornate decoration.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

A network of hundreds of interconnected wineries in caves hides under the town center.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

A medieval village holds a very modern hotel.

An archeological treasure trove stumbled upon by a couple of children.

This 19th-century fountain's namesake animal isn't what you think it is.

A mysterious light in the wood, rumoured to be the the ghost of a railroad brakeman.

Amateur taxidermy museum known for its large collection of white squirrels.

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

Yo, Adrian!

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.