A symbol of Islam in oil-rich Brunei.

This massive blockhead sculpture hides an entire library.

Dr Barnes' $25 billion private collection of art and arboretum.

Silent memorial, using bone conduction to take people back to the Dresden Bombing of 1945.

9th century Abbasid mosque, damaged in modern warfare.

World's largest permanent maze made of 18,000 conifers.

Whitewashed mosque contains the world's largest carpet.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

These strikingly barren, rolling red hills were caused by bad farming practices.

This unique Renaissance castle was turned into a home for Nazi occultism.

An emerald-green grotto just a short trip from Austin.

A meteorite-bounded town in Bavaria.

An enchanting monastery in the Spanish countryside appears lifted from a fantasy tale.

Wonderland replication in progress by one persistent man.

The world's largest church atop a political fault line.

Beautiful carved tunnels.

A German apartment building hosting as many trees as human occupants.

This turn of the century masterpiece has a mysterious goaty interloper.

A second generation sun-powered marvel lights up the night.

Longest fortress system anywhere in Europe.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

Former drug lord’s manor, now a theme park. Watch out for the hippos.