This cave system allegedly holds the "metallic library" of a lost ancient civilization.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

Hundreds of skulls and bones at the largest skeleton museum in the country.

Human skulls and a stuffed goat made into a rocking chair can be found at this strange little store.

The humble home where the famous beat author lived briefly and wrote one of his most famous works.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

A bizarre house filled with an astounding array of collections.

One man's remarkable private collection of art from around the world.

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

This charming candle shop has been in business since 1789.

A windswept necropolis carved into the rocks overlooks the "most Portuguese town in Portugal."

A lush oasis full of vibrant plants and striking geometric displays.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

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

Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

A micronation on an islet along the coast of a Portuguese island.

One of the smallest bookstores on the planet.

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

Portugal’s highest lighthouse has one of the most impressive focal planes in the world.

A hidden three-foot-wide house separates these two regal churches.

You can cross from one country to another in a single hop on this little bridge.

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

An honorary saint of the people, Maria Adelaide became an incorrupt corpse, the clothes intact, exhaling “a strong scent of roses.”

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