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

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

One of the world’s longest pedestrian suspension bridges.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This giant sculpture made of trash is a critique of society's wastefulness.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

Picturesque intersection of witchcraft and ancient Christianity.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

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

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

One of the world's steepest streets seems to have houses sliding down it.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

Tubing through a cave lit with glowworms is a magical underground experience.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

One man's ambition created this psychedelic log home.

A hotel with a rich Wild West history of miners and bootleggers.

Two creeks flow out of either end of this canyon in opposite directions.

Colorado's only true geyser is hidden within the San Juan National Forest.

A little-known hot spring haven right below the highway.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.