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

Pagan monument converted to Christianity with the population.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A neolithic tomb converted into a tiny chapel.

This crumbling Portuguese ruin overlooks the populace it once ruled.

This architectural beauty is the home to a personal collection of more than 600 examples of mechanical musical instruments.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

A unique seaside cave where Aleister Crowley faked his own death.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

A garden in Lisbon filled with giant porcelain creatures.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

One of the smallest bookstores on the planet.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

A huge cathedral single-handedly constructed by one eccentric monk.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

Infamous and now demolished panopticon prison built by its former inhabitants.

One of the world's oldest universities houses an incredible collection of anatomical models, mummified body parts, and human bones.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Shrapnel, dynamite, bullets and Franco couldn't destroy this bust, rescued and kept hidden as a family secret for over 40 years.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

The lengthy skeleton of one of the tallest Spaniards of all time is on display in Madrid.