The topiary maze at the Habsburg hunting lodge.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The "Prussian Versailles" that is as glorious today as when it was built.

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

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This strange geological landscape erupts with sudden bursts of water.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A small but immensely extravagant palace built by the "Night King."

A perfect turquoise lake colored with glacier dust.

Op-art architecture designed for happiness.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Historic medieval fortified city in southwest France.

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

The most visited, and possibly most controversial, museum in Germany.

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

A little sculpture with a large wardrobe.

The fairy tale castle of the "fairy-tale king."

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

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.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.