A beautiful but toxic fountain of mercury.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This abandoned shopping arcade has new life as an art installation.

This sacred cave temple is home to thousands of bats and according to legend, a giant snake king.

In this Balinese village, coconut shells containing placentas are hung from trees.

The name of this ancient Indonesian temple translates as "Elephant Cave" but it could be more accurately called "The Hellmouth."

One of the largest bamboo bridges in Asia, located right next to a bamboo school.

A haunting theme park is slowly being swallowed by the jungle.

This Balinese sea temple is thought to be guarded by the hundreds of monkeys that live around it.

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

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

Perhaps the most spectacular grotto along the Algarve coastline.

This fairy-tale, neo-Gothic church in the Azores is a world of magical realism.

Picturesque intersection of witchcraft and ancient Christianity.

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

A submerged village appears when dam levels drop.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

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

The ancient sauropod tracks found in this former quarry are some of the largest in the world.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.