Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Medicinal spa created with the discharge from a geothermal energy plant.

Climb right into the heart of this colorful Iceland volcano.

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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

An encyclopedic collection of mammal penises.

The greatest amusement park in the world is wall-to-wall farting dogs, puking rats, and cows with exposed breasts for the whole family.

A collection of noses tucked inside an art museum reveals how times have changed.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

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

A madman's personal garden filled with 1,000 sculpted heads.

Thousands of well-dressed mummies below a monastery.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Europe's second largest ossuary wasn't discovered until 2001.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

An ancient ossuary in Rouen.

Mysterious painted skulls in Moravia.

Structure built from the skulls of vanquished foes.