The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

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

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

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

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

A huge cathedral single-handedly constructed by one eccentric monk.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This German version of Universal Studios holds a vault of treasures from the NeverEnding Story.

This ancient burial mound is accessed by an impressive Greek-built archway.

A magical place that lets you play in and explore the world of Studio Ghibli.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

17th century mosque for Shah Abbas' harem.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

The Avenue of Mausolea is a series of grand palatial tombs.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

Roman ruins top white travertine terraces formed by ancient hot springs.

The original "capsule building" is a masterpiece of Metabolist architecture.

Flamboyant architecture from the turn of 20th century.

For a couple of months each year this Swedish city turns into a festive neon phantasmagoria.

Pompeii's less famous neighbor is still revealing her secrets.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.