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

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

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

This star-shaped military outpost is now simply trying to protect itself from neglect.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

A small Portuguese cottage formed between boulders in the countryside.

This small chapel is built of human bones and decorated with a golden skeleton.

Houses are tucked between, on, and underneath giant boulders.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This unique 230-foot waterfall is a natural beauty hidden within the vast wild landscape.

An obelisk marks the exact center of the continent, as per the calculations of the legendary Brazilian explorer Cândido Rondon.

This neo-Gothic monastery offers a rare chance to witness the unique maned wolf right up close.

This striking, two-toned confluence of rivers is visible from space.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

High plateaus and beautiful waterfalls frame this ecologically significant nature preserve.

An art museum with an eclectic design and a scandalous past.

Queen of the waterlilies, so big and strong it can support the weight of a human.

Site full of incredible prehistoric paintings and archeological findings.

A faux desert landscape in the middle of the jungle that sprouts oases during the rainy season.

Part of one of the largest flooded cavities on the planet, and littered with prehistoric animal bones.

Beautiful public park off the beaten path and away from tourists.

These termites have an large and deadly abode—impressive by day, dazzling by night.

You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.