An eerie collection of the surviving structures from a past celebration of the future.

Spain's largest bullring offers a unique glimpse at architecture and history.

The world's largest wooden structure.

The Cape of Good Hope is not quite as low as you can go on the African continent, but it's still geographically significant.

Only through deep darkness and tragedy did this elaborate royal palace become a sacred temple.

Memorial to the father of the Republic of China.

This Taiwanese promontory is covered in otherworldly hoodoo formations.

An extraordinary natural landscape of mountains, waterfalls, and rocky cliffs riddled with tunnels.

A waterfall runs right through the middle of this Taiwanese shrine to the hundreds of workers killed while building a nearby highway.

The tangled roots of a giant banyan tree have fully reclaimed the ruins of this abandoned warehouse.

The shape of this old salt factory complex was inspired by the course of the Sun.

The world's largest boar is a huge steel titan found at a French rest stop.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

The sunken structure looks like the victim of a catastrophic flood.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Historic medieval fortified city in southwest France.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.